The ferromagnetic layers of our samples were composed of fecob separated by a layer of ru. Ferromagnetic resonance of ultrathin metallic layers. Tsai,3 moongyu jang,4 qinghui yang,5 huaiwu zhang,5 and john b. Experimental details 1618 3 gtensor and magnetic anisotropy energy mae 1621 4 dynamics in the fmr, the linewidth h 1627 5 summary, outlook 1630 notes 1631. National laboratory of solid state microstructures and department of physics, nanjing university, 22 hankou road, nanjing, 210093 p. Within the ferromagnetic regime, that is at temperatures above the antiferromagnetic. Arkadyev when he observed the absorption of uhf radiation by ferromagnetic materials in 1911.
Main types of resonance phenomenon can be listed as nuclear magnetic resonance nmr, nuclear quadrupole resonance nqr, electron paramagneticspin resonance epr, esr, spin wave resonance swr, ferromagnetic resonance fmr, antiferromagnetic resonance afmr and conductor electron spin resonance cesr. Alzate,3 pramey upadhyaya,3 juergen langer,4 pedram khalili amiri,3 kang l. View the article pdf and any associated supplements and figures for a period of. Ferromagnetic resonance in nanometric epitaxial fe3si films on 111ge nuno m. An ferh thin film of 33 nm thickness grown by molecular beam epitaxy mbe has been investigated with respect to its temperature dependent magnetic properties by means of ferromagnetic resonance fmr. Aug 26, 2016 the resonance line broadening is described by a distribution of the fmr intensity over a range of frequencies rather than to energy losses to spin wave modes. Observe microwave ferromagnetic resonance phenomena of ferromagnetic materials. In 1932 he moved to sverdlovsk now yekaterinburg and started working at the ural physicotechical institute, later at the metals physics institute of the ural branch of the russian academy of sciences. Spin torque ferromagnetic resonance induced by the spin. These values are of huge importance for technical advance, e. It is necessary to account for extrinsic inhomogeneous linewidth and twomagnon scattering broadening. Ferromagnetic resonance temperature dependence is used to study the magnetic.
Introduction magnetic anisotropy determines the practical magnetic properties of ferromagnetic materials. We present impedance measurements of an insulated multilayer film as a function of the applied magnetic field both in the plane of the sample and perpendicular to it. Ferromagnetic resonance in ferromagneticantiferromagnetic. The resonant may be an isolated ionic spin as in electron paramagnetic resonance epr or a nuclear magnetic resonance nmr.
By using a broadband coaxialline method, we extract the magnetic permeability in the frequency range from 1 to 12 ghz, and we study the shift of the ferromagnetic resonance fmr with respect to. Ferromagnetic resonance, or fmr, is a spectroscopic technique to probe the magnetization of ferromagnetic materials. The effective demagnetizing factors are derived from anisotropy energy g and a static field direction expressed by a spherical coordinate system. Vonsovskii, ferromagnetic resonance, pergamon press. Based on the energy of equilibrium, the ferromagnetic resonance for ferromagnetic fmantiferromagnetic afm bilayers under the stress field is studied by using smith and beljerss method. Ferromagnetic resonance studies of coupled magnetic. Aug 12, 2010 nanoscale scanning probe ferromagnetic resonance imaging using localized modes. Sband ferromagnetic resonance spectroscopy and the. A close correlation is found between the ferromagnetic resonance line shape and the positive peak in the ac magnetoresistance, which suggests the possibility of electrical detection of ferromagnetic resonance using high frequency current injected into a conducting magnetic sample. Ferromagnetic resonance in russian, fizmatgiz, moscow 1961, p.
Voltageinduced ferromagnetic resonance in magnetic. The phenomenon of resonant absorption of a highfrequency magnetic field in ferromagnetic substances kindle edition by vonsovskii, s. Ferromagnetic resonance fmr is the resonant absorption of. Ferromagnetic resonance fmr and torsion magnetometry were carried out on 60 ni40 fe 111 oligatomic thin films 2. Krivorotov1 1department of physics and astronomy, university of california, irvine, california 92697, usa 2hitachi global storage. The last chapters describe nonlinear processes that occur during ferromagnetic resonance in ferrites.
Simple equations of effective demagnetizing factors n x e and n y e for use in kittels ferromagnetic resonance fmr formula have been derived for the first time. Ferromagnetic resonance studies on patterned trilayer. It is shown that the stresses increase continuously from the center of the cord and attain maximum values on its surface. Ferromagnetic resonance of particulate magnetic recording tapes. Ferromagnetic resonance download ebook pdf, epub, tuebl. Poster tnt2009 september 0711, 2009 barcelonaspain ferromagnetic resonance in nanometric epitaxial fe3si films on 111ge nuno m. Ferromagnetic resonance fmr is a powerful experimental technique for studying ferromagnetic materials. The phenomenon of resonant absorption of a highfrequency. The theory of ferromagnetic resonance in a linear approximation is also considered, along with ferromagnetic resonance in metals and line width of ferromagnetic resonance absorption. Field control of ferromagnetic resonance and spin pumping in ptyig at room temperature. The angular dependence of the resonance line position is analyzed within a thermodynamic approach that includes shape anisotropy ellipsoids of revolution, magnetocrystalline anisotropies cubic and uniaxial, and dipoledipole interactions. Ferromagnetic resonance can give values of m s and k as well as, without the need to know the dimensions or mass of the sample.
The thin fm film is taken to be a single crystal with cubic and uniaxial magnetocrystalline anisotropies, while the thickness of afm layer is semiinfinite but with single uniaxial. V download it once and read it on your kindle device, pc, phones or tablets. The resonant frequency is an important parameter in their operation, which is generally determined by the. The book discusses the theory of ferromagnetic resonance in detail and the investigations and treatments of problems in this theory. Ferromagnetic resonance study of fe superparamagnetic. Ferromagnetic resonance biosensor for homogeneous and. Vonsovskii, ferromagnetic resonance academic, new york.
A particularly well established technique is the ferromagnetic resonance fmr generated by the coupling of microwave photons and magnetization eigenmodes in the ghz range. Ferromagnetic resonance an overview sciencedirect topics. The method of ferromagnetic resonance is used to study the residual stresses that appear in the cord of amorphous microwire in the process of its fabrication. Pdf the contribution that the technique of ferromagnetic resonance fmr. Read ferromagnetic resonance and hall effect characterization of gamnsb layers, journal of superconductivity and novel magnetism on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Equivalent permeability when a specimen of ferromagnetic material is magnetized parallel to its surface 149 4. Honours, simon fraser university, 1981 a thesis submitted in partial fulfillment of. Zhiteytsev 1, kohei hamaya 2, taizoh sadoh 2, masanobu miyao 2, and nikolai a. This technique allows for a voltagedriven piezoelectric excitation to drive magnetostrictive thin films into resonance with a much greater coupling efficiency than is possible using traditional methods. Mar 14, 2007 we report on room temperature ferromagnetic resonance fmr studies of t co2t ni. Summary of data of griffiths on ferromagnetic resonance in plane specimens. The fmr measurements were conducted with a high frequency. The phenomenon of resonant absorption of a highfrequency magnetic field in ferromagnetic.
Ferromagnetic resonance of yig film in low frequency region. Ferromagnetic resonance in nanometric epitaxial fe3si. We report on room temperature ferromagnetic resonance fmr. The angular dependence of the frequency linewidth is investigated in the plane containing the anisotropy axis and in the film plane. Antiferromagnetic and ferromagnetic resonance maglab. Ferromagnetic resonance studies of coupled magnetic systems. Ferromagnetic resonance was experimentally discovered by v. In 1932 he graduated from the leningrad university. Vonsovskii, ferromagnetic resonance academic, new york, 1966, pp. Ferromagnetic resonance of a yig film in the low frequency regime seongjae lee,1 scott grudichak,2 joseph sklenar,2 c. Ferromagnetic resonance absorption was discussed theoretically gans and loyarte 1. Pdf ferromagnetic resonance of ultrathin metallic layers. For each microwave frequency there is a correlated static magnetic field where the fmr occurs.
Ferromagnetic resonance study of sputtered coni multilayers. Investigation of ultrathin ferromagnetic films by magnetic resonance klaus baberschke freie universit. In ferro magnets, one of the most important quantities is the mae and its temperature dependence heinrich, 1994. Our variational calculation accurately predicts the frequencies of the localized modes in fmr spectra, and characterizes the sizes and all. The most important parameters for ferromagnets, such as the magnetic anisotropies, the lande gfactor or the gilbertdamping, can be deduced by broadband fmr. Ferromagnetic resonance fine structure of dispersed magnets. A typical resonance curve is shown in figure 2, from the work of yager and bozorth 7 on supermalloy. Ferromagnetic resonance line width in inhomogeneous thin. Beaujour et al ferromagnetic resonance study of sputtered coni multilayers 3 fig.
Ferromagnetic resonance in nanometric epitaxial fe3si films. Sband ferromagnetic resonance spectroscopy and the detection of. Chapter 8 magnetic resonance trinity college dublin. Use features like bookmarks, note taking and highlighting while reading ferromagnetic resonance. The angular dependence of the resonance line position is analyzed within a thermodynamic approach that includes shape anisotropy ellipsoids of revolution, magnetocrystalline anisotropies. Ferromagnetic resonance theory and applications request pdf. Outofplane magnetic field orientation dependence of resonance field and linewidth has been measured. Spin torque ferromagnetic resonance induced by the spin hall effect luqiao liu, takahiro moriyama, d. In ferromagnetic materials, b res varies with the net magnetic shape, magnetocrystalline anisotropy of the system. We present impedance measurements of an insulated multilayer film as a function of the applied magnetic field both in the plane of the sample and perpendicular to it, for frequencies from 300 khz to 3 ghz. Investigation of ultrathin ferromagnetic films by magnetic resonance. Ferromagnetic resonance and hall effect characterization. Fmr is very broadly similar to electron paramagnetic resonance epr, and also somewhat similar to nuclear magnetic resonance nmr, except that fmr probes the sample magnetization resulting from the magnetic.
Tunable zerofield ferromagnetic resonance frequency from. The electromagnetic resonance techniques have become a central field of modern scientific and technical activity. We report the use of sband ferromagnetic resonance fmr spectroscopy to compare the anisotropic properties of magnetite particles in chains of cultured intact magnetotactic bacteria mtb between 300 and 15 k with those of sediment samples of holocene age in order to infer the presence of magnetofossils and their preservation in a geological time frame. The effect of ferromagnetic resonance fmr on magnetoimpedance mi of multilayer thin films is investigated. Ferromagnetic resonance spectroscopy applied magnetics. In this article, we study the inplane ferromagnetic resonance fmr and. The resonance peaks are clearly observed and can be well described by the solution to the llg equation for example equation 32 in ref. Ferromagnetic resonance linewidth and twomagnon scattering.
Some unusual broadening of the lines in the fmr spectra and certain. Size dependence of ferromagnetic resonance frequency in. Ferromagnetic resonance of a 2d array of nanomagnets arxiv. Ferromagnetic resonance in gigahertz magnetoimpedance of.
However, in the practice, fmr linewidth is broadened by various surfaceinterface nonuniformity and defects. It is a standard tool for probing spin waves and spin dynamics. Also, resonance effects are associated with the spin. Ferromagnetic resonance investigations on ni nanowires are reported. Ferromagnetic resonance was unknowingly discovered by v. Nature of the skin effect for ferromagnetic resonance with magnetic structure neglected. Voltageinduced ferromagnetic resonance in magnetic tunnel junctions jian zhu,1 j. Ferromagnetic resonance is exhibited in the selective absorption of electromagnetic field energy by a ferromagnet at frequencies that coincide with the natural precessional frequencies. The ep r technique gives better results at unpaired electron systems. The phenomenon of resonant absorption of a high frequency magnetic field in ferromagnetic substances is a collection of papers on the basic theory of ferromagnetic resonance.
Calculated line width results show a linear frequency dependence of the ferromagnetic resonance line width with slope and zerofrequency intercept. The anisotropy tends to be large in these samples, and high fields and frequencies are extremely useful in characterizing these systems, enabling the observation of anti ferromagnetic. Fmr is very broadly similar to electron paramagnetic resonance epr, and also somewhat similar to nuclear magnetic resonance nmr, except that fmr probes the sample magnetization resulting from the. The network analyzer ports are connected directly to the cpw. Evaluation of the distribution of residual stresses in the. Mar 06, 20 we report the use of sband ferromagnetic resonance fmr spectroscopy to compare the anisotropic properties of magnetite particles in chains of cultured intact magnetotactic bacteria mtb between 300 and 15 k with those of sediment samples of holocene. Ferromagneticresonance of singlecrystal yiggadolinium. A qualitative explanation of fmr along with an explanation of the results from arkadyev was offered up by ya. Vonsovskii, ferromagnetic resonance pergamon, oxford, 1966. The fmr technique depends on the geometry of the sample at. In past investigations, most attention has been concentrated on the resonance field hr, with relatively little. Detection of electronspin resonance,2 nuclear magnetic resonance,3 and ferromagnetic resonance fmr refs. The phenomenon of resonant absorption of a highfrequency magnetic field in ferromagnetic substances volume 4 on free shipping on qualified orders. Technically antiferro and ferromagnetic resonance utilize the same technique as paramagnetic resonance, but the exchange interaction leads to different physics.
Ferromagnetic resonance and exchange anisotropy in. Basically, it is analogous to the electron paramagnetic resonance epr. Ferromagnetic resonance article about ferromagnetic. Synthetic antiferromagnetic saf structures consist of two ferromagnetic layers separated by a nonmagnetic spacer, coupled through the indirect exchange interaction. Microwave magnetoimpedance and ferromagnetic resonance. Detection of localized ferromagnetic resonance in a. Ferromagnetism article about ferromagnetism by the free. Ferromagnetic resonance, or fmr, is a spectroscopic technique to probe the magnetization of. The book ferromagnetic resonance theory and applications highlights recent advances at the interface between the science and technology of nanostructures bilayermultilayers, nanowires, spinel. Ferromagnetic resonance study of fe superparamagnetic nanoclusters on gaas 100 article pdf available in journal of applied physics 8911 june 2001 with 18 reads how we measure reads.
The phenomenon is caused by the interface of the cord and the glass sheath. A theoretical investigation of the effect of the oblique. The effect of the tilt angle on the frequency linewidth is shown. Acoustically driven ferromagnetic resonance for device. Ferromagnetic resonance in nickel at low temperatures by jeffrey macleod rudd b.
Buhrman cornell university, ithaca, new york, 14853 abstract we demonstrate that the spin hall effect in a thin film with strong spinorbit scattering can excite magnetic precession in an adjacent ferromagnetic film. Nanoscale scanning probe ferromagnetic resonance imaging. Nanoscale scanning probe ferromagnetic resonance imaging using localized modes. Surface effects on ferromagnetic resonance in magnetic. Click download or read online button to get ferromagnetic resonance book now. Ferromagnetic resonance theory and applications intechopen. This site is like a library, use search box in the widget to get ebook that you want. Ferromagnetic resonance is commonly used in the study of thin ferromagnetic films.
Dec 12, 2011 this is the condition in which the magnetization whole sample precesses synchronously. The effect of the oblique anisotropy axis on the ferromagnetic resonance fmr linewidth in a thin film is studied theoretically. This microwave ferromagnetic resonance apparatus is an experimental instrument for measuring the ferromagnetic resonance curve of ferromagnetic samples. To study the anisotropy, ferromagnetic resonance fmr measurement is highlysuitable. Sband ferromagnetic resonance spectroscopy and the detection. Nanoscale confined mode ferromagnetic resonance imaging of. Anisotropies of the films, determined by both methods, agree roughly.
Trukhan et al 2008 applied magnetic resonance 33 57. Tunable zerofield ferromagnetic resonance frequency in wide range is very useful for the application of microwave devices. The book ferromagnetic resonance theory and applications highlights recent advances at the interface between the science and technology of nanostructures bilayermultilayers, nanowires, spinel type nanoparticles, photonic crystal, etc. Ferromagnetic resonance in nickel at low temperatures. It is used to measure the gyromagnetic ratio, anisotropy field, and damping constant of magnetic materials. We report the use of sband ferromagnetic resonance fmr spectroscopy to compare the anisotropic properties of magnetite particles in chains of cultured. In this thesis, we explore the acoustically driven ferromagnetic resonance effect in composite straincoupled multiferroic bilayers.
Ferromagnetic resonance study of sputtered co ni multilayers. Role of magnetic microstructure for ferromagnetic resonance with a conducting ferromagnetic film. Ferromagnetic resonance on ni nanowire arrays journal of. Influence of skin effect and exchange interaction on ferromagnetic resonance in metals 144 1. Effective demagnetizing factors in ferromagneticresonance. Aug 12, 2010 advances in nanomagnetics research have brought powerful applications in magnetic sensing technology, but so far no highresolution magneticimaging tool is available to characterize complex. Ferromagnetic resonance is a very sensitive method for measuring the magnetic properties of materials via the precessional magnetization dynamics defined by the systems magnetic free energy. Ferromagnetic resonance is a comprehensive account of the basic theory of ferromagnetic resonance, that is, the resonant absorption of a highfrequency magnetic field in ferromagnetic substances. According to vonsovskii,1 ferromagnetic resonance fmr was unknowingly discovered by arkadyev in 1911.
Nonetheless, ferromagnetic resonance fmr, which is a well known. Experimentally we find that for zero magnetic field the total saturation magnetization is only reduced by approxi mately 10% from the ma. Ferromagnetic resonance and torsion magnetometry in. Using this apparatus, the following experiments can be conducted. A qualitative explanation of fmr along with an explanation of the. Dorfman in 1923 when he suggested that the optical transitions due to zeeman splitting could provide a way to study. We demonstrate and characterize the localized ferromagnetic resonance fmr modes created in an individual micronsized ni 81 fe 19 disk by means of a strong inhomogeneous probe field applied antiparallel to the saturated magnetization of the sample.
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