Size dependence of ferromagnetic resonance frequency in submicron patterned magnet takashi manago1, kazuto yamanoi1, satoshi yakata2. Yuan et althe origin of spin current in yignonmagnetic metal multilayers at ferromagnetic resonance yun kang et althis content was downloaded from ip address 157. Technically antiferro and ferromagnetic resonance utilize the same technique as paramagnetic resonance, but the exchange interaction leads to different physics. Dec 01, 2019 in this thesis, we explore the acoustically driven ferromagnetic resonance effect in composite straincoupled multiferroic bilayers. Basically, it is analogous to the electron paramagnetic resonance epr. Due to large magnetic anisotropy the samples demonstrate subterahertz electromagnetic wave absorption by natural zerofield ferromagnetic resonance nfmr. The resonance frequency, relaxation, linewidth, lande g factor spectroscopic g factor, the coercive force, the anisotropy field, shape of the specimen, symmetry axes of the crystal and temperature characterized fmr spectra. Because of electronnuclear mass differences, the magnetic moment of an electron is substantially larger than the corresponding quantity for any nucleus, so that a much higher electromagnetic frequency is needed to bring about a spin resonance with an electron than. Kent1,a 1department of physics, new york university, new york, new york 3, usa 2ibm t. Ferromagnetic resonance download ebook pdf, epub, tuebl, mobi. Ferromagnetic resonance fmr is connected with spin precession about the magnetization vector due to the effect of a highfrequency electromagnetic field applied such that the magnetic component is perpendicular to the magnetization vector antonenko et al. Evolution of ferromagnetic and spinwave resonances with crystalline order in thin films of fullheusler alloy co2mnsi j.
Pdf high frequency ferromagnetic resonance measurements. Related content ferromagnetic resonance measurements in subnanometer fe films hayato mizuno, takahiro moriyama. Express 11 053008 view the article online for updates and enhancements. 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 of yig film in low frequency region. Larmor precession frequency for electron spin is 2 f. Nonlinear ferromagnetic resonance in permalloy films. Ferromagnetic resonance tunability by microwave frequency in. Pdf nonlinear ferromagnetic resonance in permalloy films. The book discusses the theory of ferromagnetic resonance in detail and the investigations and treatments of problems in this theory. The presence of ferromagnetic resonance tunability by microwave frequency in magnetic bilayer thin film is confirmed by reduction in fmr output signal and broadening of fmr line width with respect to the increase in microwave frequency as shown in figure 4. Ferromagnetic moment precession ferromagnetic resonance fmr ghz range.
Ferromagnetic resonance of a yig film in the low frequency. Homodyne detection of ferromagnetic resonance by a non. 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. Pdf high frequency ferromagnetic resonance measurements in. Acoustically driven ferromagnetic resonance for device.
The effect of sublattice structure of ferromagnetic semiconduc tors on the resonance frequency 49 8. Antiferromagnetic and ferromagnetic resonance maglab. With a constant microwave frequency, it was found that a maximum power absorption. Tsai,3 moongyu jang,4 qinghui yang,5 huaiwu zhang,5 and john b. 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 antiferromagnetic.
Ferromagnetic resonance and damping properties of cofeb thin. The electromagnetic resonance techniques have become a central field of modern scientific and technical activity. Outofplane angular dependence of ferromagnetic resonance spectra was measured in sputtered copt multilayers and analyzed with the landaulifshitzgilbert equation. We performed an investigation of the static and high frequency magnetic. The phenomenon of resonant absorption of a highfrequency.
Thermodynamic theory of resonance phenomena in ferromagnetics 59 10. Resonance was excited in the magnetic samples with coplanar waveguides cpws, and the resulting absorption change was analyzed in the frequency domain to yield the magnetization and damping of the measured samples. Pdf we present a theoretical equation for the ferromagnetic resonance fmr frequency of a synthetic antiferromagnet saf patterned into a. Spintorque driven ferromagnetic resonance in a nonlinear regime w. V download it once and read it on your kindle device, pc, phones or tablets. It is a standard tool for probing spin waves and spin dynamics. M eff is found to increase with decreasing t pt and decreasing 1t co, which can be considered as a result of interplay between the interlayer coupling and a lowdimensional effect. Jul 18, 2017 resonance in a ferromagnetic sphere, known in the body of literature as the mode of uniform precession, has recently been proven to be magnetic plasmon resonance mpr. Homodyne detection of ferromagnetic resonance by a nonuniform radio frequency excitation current to cite this article. Enhanced gilbert damping in thin ferromagnetic films.
Ferromagnetic resonance on ni nanowire arrays journal of. More recently, measurements with systems operating in the qband 34 ghz are more widely used as instrument advances have been made 46. Dynamic magnetic susceptibility and electrical detection of. The basic concepts of epr are analogous to those of nuclear magnetic resonance nmr, but it is electron spins that are excited instead of the spins of atomic nuclei. The effect of domain structure on the resonance frequency 44 7. Ferromagnetic resonance theory and applications intechopen. Ferromagnetic resonance an overview sciencedirect topics. We investigated the size effect on ferromagnetic resonance fmr in a submicron wide single permalloy bar. Experimental setup to perform ferromagnetic resonance studies at. The conclusion is given in section 4, followed by the acknowledgements. Ferrimagnetic resonance article about ferrimagnetic.
This microwave ferromagnetic resonance apparatus is an experimental instrument for measuring the ferromagnetic resonance curve of ferromagnetic samples. Observation of azimuthal ferromagnetic resonance modes in. The method used consists on applying an oscillating magnetic field. The ep r technique gives better results at unpaired electron systems. As a rule, the observation of fmr needs the application of an external d. Lounasmaa laboratory, aalto university, po box 15100, fi00076, finland 2department of applied physics, aalto university, po box 14100, fi00076, finland. Ferromagnetic resonance fmr technique was initially applied to ferromagnetic materials, all magnetic materials and unpaired electron systems. 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. Ferromagnetic resonance fmr, ferromagnetic antirresonance fmar and low field magnetoimpedance mi are the characteristic features of high frequency losses in applied fields.
The angular dependence of the resonance line position is analyzed within a thermodynamic approach that includes shape anisotropy ellipsoids of revolution, magnetocrystalline anisotropies. The resonant frequency is an important parameter in their operation, which is generally determined by the. Tunable zerofield ferromagnetic resonance frequency from s. Size dependence of ferromagnetic resonance frequency in. The fmr technique depends on the geometry of the sample at hand. 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. Magnetoimpedance measurements of ferromagnetic resonance. Frequencyswept ferromagnetic resonance characterization.
Nov 23, 2015 tunable zerofield ferromagnetic resonance frequency in wide range is very useful for the application of microwave devices. 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. Phenomenological theory of ferromagnetic resonance 1. The resonance frequency, relaxation, linewidth, lande g factor spectroscopic g factor, the coercive force, the anisotropy field, shape of the specimen, symmetry axes. At frequencies higher than the ferromagnetic resonance, the magnetic wire impedance. Ketterson2 1department of physics, research institute for natural sciences, hanyang university, seoul, 3791 south korea. Dynamic magnetic susceptibility and electrical detection. The magnetic susceptibility and consequently the absorption relative to the shf field is proportional to the magnetic susceptibility relative to the static field. Frequencyswept ferromagnetic resonance characterization of. Phenomenological approach to damping in the equation of motion for the magnetization of a ferromagnetic 54 9. Use features like bookmarks, note taking and highlighting while reading ferromagnetic resonance. Ferromagnetic resonance study of sputtered co ni multilayers. Also, the magnetic anisotropies and high ferromagnetic resonance frequency of co nanowire arrays, are shown to be determined by the combined effect of shape anisotropy.
Ferromagnetic resonance fmr is connected with spin precession about the magnetization vector due to the effect of a high frequency electromagnetic field applied such that the magnetic component is perpendicular to the magnetization vector antonenko et al. The dynamic properties of permalloy thin films were studied with vector network analyzer based ferromagnetic resonance vnafmr. The absorption lines shift with aluminum substitution from 160 ghz x 4 to 250 ghz x 5. Chapter 8 magnetic resonance trinity college dublin. Homodyne detection of ferromagnetic resonance by a nonuniform radiofrequency excitation current to cite this article. The phenomenon of resonant absorption of a highfrequency magnetic field in ferromagnetic substances kindle edition by vonsovskii, s. Equation of motion for the magnetization of a system of weakly interacting magnetic electron moments 3. Measurement of the frequency and fielddependent, complex susceptibility, w.
Ferromagnetic resonance investigations on ni nanowires are reported. As for the ferromagnetic resonance frequency, it increases with increasing value of the applied field, and zero. Observation of azimuthal ferromagnetic resonance modes in 1. Ferromagnetic resonance, or fmr, is a spectroscopic technique to probe the magnetization of ferromagnetic materials. Broadband ferromagnetic resonance of ni81fe19 wires. The principle of the spinorbit ferromagnetic resonance sofmr technique is illustrated in fig. In this thesis, we explore the acoustically driven ferromagnetic resonance effect in composite straincoupled multiferroic bilayers. Observation of ferromagnetic resonance in a microscopic. Fmr is very broadly similar to electron paramagnetic resonance epr, and also somewhat similar to nuclear magnetic resonance nmr, except that fmr probes the. Ferromagnetic resonance tunability by microwave frequency in bilayer fe97si3pt thin film. Ferromagnetic resonance article about ferromagnetic. The cavitybased approach is widely used in chemistry for electron spin resonance measurements and has traditionally operated in the xband frequency range 9 ghz 45. Uniform ferromagnetic resonance, like electron paramagnetic resonance epr, can be detected by the methods of radiofrequency spectroscopy.
An external magnetic field was applied parallel to the surface of the thin film. The ferromagnetic resonance spectra as functions of the frequency. Request pdf ferromagnetic resonance of a yig film in the low frequency regime an improved method for characterizing the magnetic anisotropy of films with cubic symmetry is described and is. The instruction manual contains comprehensive materials including experimental configurations, principles and stepbystep instructions.
Ferromagnetic resonance fmr is a versatile technique and is widely used for studying magnetic anisotropy and relaxation in thin. The fmr measurements were performed by a vector network analyzer vna technique with scanning frequency at a speci. May 11, 2018 the dynamic properties of permalloy thin films were studied with vector network analyzer based ferromagnetic resonance vnafmr. Hexaferrite materials displaying ultrahigh coercivity and. Ferromagnetic resonance revised electrodynamic approach. Spin dynamics in the ferromagnetic resonance science. 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.
This type of ferrimagnetic resonance does not differ from ferromagnetic resonance, and therefore the term ferromagnetic resonance alone is often used in the scientific literature to describe both ferromagnetic and ferrimagnetic resonance. Electron paramagnetic resonance epr or electron spin resonance esr spectroscopy is a method for studying materials with unpaired electrons. There have been several reports18 on the dynamic properties of cofeb thin. The llg equation including the spintransfer torque term, and the frequency spectrum analysis method are used to study the dynamic process of ferromagnetic resonance. Spintorque driven ferromagnetic resonance in a nonlinear. Spintorque ferromagnetic resonance measurements of. Ferromagnetic resonance at high power ferromagnetic resonance in dilute ironsilicon alloys the theory of ferromagnetic resonance at. Ferromagnetic resonance fmr is an important phenom. Watson research center, yorktown heights, new york 10598, usa received 14 september 2009. Ferromagnetic resonance download ebook pdf, epub, tuebl. Angular dependence of the ferromagnetic resonance parameters. The energy lost by a highfrequency current flowing in a conductor is dependent on the product of the electrical resistivity.
Epr spectroscopy is particularly useful for studying metal complexes or organic radicals. The linear dependence of frequency of resonance field may be calculated from 1 ghz to 100 ghz range in frequency spectra l, s, c, x, k, q, v, e, w, f, and dband. Ferromagnetic resonance in iron at high temperatures pdf. The authors directly measure the magnetic damping parameter. The phenomenon of resonant absorption of a high frequency magnetic field in ferromagnetic substances kindle edition by vonsovskii, s. Ferromagnetic resonance in iron at high temperatures.
Cn magnetic properties of interfaces multilayers, superlattices, heterostructures 1 introduction an understanding of magnetization dynamics in very thin. Ferromagnetic resonance of a yig film in the low frequency regime seongjae lee,1 scott grudichak,2 joseph sklenar,2 c. Isbn 9789535111863, pdf isbn 9789535150435, published 20731. Ferromagnetic resonance study of thicknessdependent. Ferromagnetic resonance and damping properties of cofeb. Angular dependence of the ferromagnetic resonance parameters of tifeni 6 ticutifeniti 6 nanostructured multilayered elements in the wide frequency range by sergei v. Ketterson2 1department of physics, research institute for natural sciences, hanyang university, seoul, 3791 south korea 2department of physics and astronomy, northwestern university, evanston il, 60208 usa. In the lowfrequency case, the specific feature of ferrimagnetic resonance is exhibited only in a. Ferromagneticresonance of singlecrystal yiggadolinium. Ferromagnetic resonance in copt multilayers springerlink. Anomalous highfrequency resistance of ferromagnetic.
The magnetic field dependences of the resonance frequency and the rectification spectrum are presented and analytically interpreted on the standpoint of a. Ahmad s 1, shah j 1, chaujar r 2, puri nk 2, negi ps 1 and kotnala rk 1. Fmr is very broadly similar to electron paramagnetic resonance, and also somewhat similar to nuclear magnetic resonance, except that fmr probes the sample magnetization resulting from the magnetic moments of dipolarcoupled but unpaired electrons, while nmr probes the magnetic moment of atomic nuclei that are screened. Pdf ferromagnetic resonance frequency of a patterned.