Nonlinear ferromagnetic resonance in permalloy films. Ferromagnetic resonance in copt multilayers springerlink. The effect of domain structure on the resonance frequency 44 7. 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. Spintorque driven ferromagnetic resonance in a nonlinear regime w. Uniform ferromagnetic resonance, like electron paramagnetic resonance epr, can be detected by the methods of radiofrequency spectroscopy. 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. Ferrimagnetic resonance article about ferrimagnetic. Ferromagnetic resonance fmr, ferromagnetic antirresonance fmar and low field magnetoimpedance mi are the characteristic features of high frequency losses in applied fields.
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. Pdf ferromagnetic resonance frequency of a patterned. Homodyne detection of ferromagnetic resonance by a nonuniform radio frequency excitation current to cite this article. We investigated the size effect on ferromagnetic resonance fmr in a submicron wide single permalloy bar. The resonance frequency, relaxation, linewidth, lande g factor spectroscopic g factor, the coercive force, the anisotropy field, shape of the specimen, symmetry axes. Watson research center, yorktown heights, new york 10598, usa received 14 september 2009. 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 resonance article about ferromagnetic. At frequencies higher than the ferromagnetic resonance, the magnetic wire impedance. The angular dependence of the resonance line position is analyzed within a thermodynamic approach that includes shape anisotropy ellipsoids of revolution, magnetocrystalline anisotropies. The phenomenon of resonant absorption of a highfrequency.
Resonance in a ferromagnetic sphere, known in the body of literature as the mode of uniform precession, has recently been proven to be magnetic. In the lowfrequency case, the specific feature of ferrimagnetic resonance is exhibited only in a. More recently, measurements with systems operating in the qband 34 ghz are more widely used as instrument advances have been made 46. Express 11 053008 view the article online for updates and enhancements.
The authors directly measure the magnetic damping parameter. Ferromagnetic resonance tunability by microwave frequency in bilayer fe97si3pt thin film. Antiferromagnetic and ferromagnetic resonance maglab. With a constant microwave frequency, it was found that a maximum power absorption. The principle of the spinorbit ferromagnetic resonance sofmr technique is illustrated in fig. Ahmad s 1, shah j 1, chaujar r 2, puri nk 2, negi ps 1 and kotnala rk 1.
Phenomenological approach to damping in the equation of motion for the magnetization of a ferromagnetic 54 9. Hexaferrite materials displaying ultrahigh coercivity and. Homodyne detection of ferromagnetic resonance by a non. Dynamic magnetic susceptibility and electrical detection of. Ketterson2 1department of physics, research institute for natural sciences, hanyang university, seoul, 3791 south korea. Anomalous highfrequency resistance of ferromagnetic. Observation of azimuthal ferromagnetic resonance modes in. Ferromagnetic resonance in iron at high temperatures pdf. Homodyne detection of ferromagnetic resonance by a nonuniform radiofrequency excitation current to cite this article. 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. Size dependence of ferromagnetic resonance frequency in submicron patterned magnet takashi manago1, kazuto yamanoi1, satoshi yakata2. 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.
The instruction manual contains comprehensive materials including experimental configurations, principles and stepbystep instructions. The conclusion is given in section 4, followed by the acknowledgements. Related content ferromagnetic resonance measurements in subnanometer fe films hayato mizuno, takahiro moriyama. Tunable zerofield ferromagnetic resonance frequency from s. Phenomenological theory of ferromagnetic resonance 1. Measurement of the frequency and fielddependent, complex susceptibility, w.
Chapter 8 magnetic resonance trinity college dublin. Ferromagnetic resonance download ebook pdf, epub, tuebl, mobi. The electromagnetic resonance techniques have become a central field of modern scientific and technical activity. Observation of azimuthal ferromagnetic resonance modes in 1. Ferromagnetic resonance theory and applications intechopen. The magnetic susceptibility and consequently the absorption relative to the shf field is proportional to the magnetic susceptibility relative to the static field. 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. Observation of ferromagnetic resonance in a microscopic. Ferromagnetic resonance revised electrodynamic approach. The ferromagnetic resonance fmr behaviors for ni 80fe 20 permalloy. Ferromagnetic resonance of yig film in low frequency region.
The ep r technique gives better results at unpaired electron systems. The book discusses the theory of ferromagnetic resonance in detail and the investigations and treatments of problems in this theory. 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. May 11, 2018 the dynamic properties of permalloy thin films were studied with vector network analyzer based ferromagnetic resonance vnafmr. Due to large magnetic anisotropy the samples demonstrate subterahertz electromagnetic wave absorption by natural zerofield ferromagnetic resonance nfmr. 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. 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.
Tsai,3 moongyu jang,4 qinghui yang,5 huaiwu zhang,5 and john b. Enhanced gilbert damping in thin ferromagnetic films. 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. The magnetic field dependences of the resonance frequency and the rectification spectrum are presented and analytically interpreted on the standpoint of a.
Ferromagnetic resonance download ebook pdf, epub, tuebl. Pdf high frequency ferromagnetic resonance measurements in. Larmor precession frequency for electron spin is 2 f. Isbn 9789535111863, pdf isbn 9789535150435, published 20731. Outofplane angular dependence of ferromagnetic resonance spectra was measured in sputtered copt multilayers and analyzed with the landaulifshitzgilbert equation.
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. Angular dependence of the ferromagnetic resonance parameters of tifeni 6 ticutifeniti 6 nanostructured multilayered elements in the wide frequency range by sergei v. Technically antiferro and ferromagnetic resonance utilize the same technique as paramagnetic resonance, but the exchange interaction leads to different physics. The phenomenon of resonant absorption of a high frequency magnetic field in ferromagnetic substances kindle edition by vonsovskii, s. The absorption lines shift with aluminum substitution from 160 ghz x 4 to 250 ghz x 5. Fmr is very broadly similar to electron paramagnetic resonance epr, and also somewhat similar to nuclear magnetic resonance nmr, except that fmr probes the.
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 tunability by microwave frequency. 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 tunability by microwave frequency in. There have been several reports18 on the dynamic properties of cofeb thin. Frequencyswept ferromagnetic resonance characterization of. Lounasmaa laboratory, aalto university, po box 15100, fi00076, finland 2department of applied physics, aalto university, po box 14100, fi00076, finland. Ferromagnetic resonance fmr is a versatile technique and is widely used for studying magnetic anisotropy and relaxation in thin. 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. The dynamic properties of permalloy thin films were studied with vector network analyzer based ferromagnetic resonance vnafmr. The fmr technique depends on the geometry of the sample at hand.
Dec 01, 2019 in this thesis, we explore the acoustically driven ferromagnetic resonance effect in composite straincoupled multiferroic bilayers. Electron paramagnetic resonance epr or electron spin resonance esr spectroscopy is a method for studying materials with unpaired electrons. The method used consists on applying an oscillating magnetic field. Spintorque driven ferromagnetic resonance in a nonlinear.
We performed an investigation of the static and high frequency magnetic. The ferromagnetic resonance spectra as functions of the frequency. 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. Broadband ferromagnetic resonance of ni81fe19 wires. The energy lost by a highfrequency current flowing in a conductor is dependent on the product of the electrical resistivity. Experimental setup to perform ferromagnetic resonance studies at. Pdf we present a theoretical equation for the ferromagnetic resonance fmr frequency of a synthetic antiferromagnet saf patterned into a. Ferromagnetic moment precession ferromagnetic resonance fmr ghz range. Magnetoimpedance measurements of ferromagnetic resonance. Ferromagnetic resonance in iron at high temperatures. Epr spectroscopy is particularly useful for studying metal complexes or organic radicals. Ferromagnetic resonance of a yig film in the low frequency.
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. As for the ferromagnetic resonance frequency, it increases with increasing value of the applied field, and zero. Ferromagnetic resonance fmr is an important phenom. 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 cavitybased approach is widely used in chemistry for electron spin resonance measurements and has traditionally operated in the xband frequency range 9 ghz 45. Thermodynamic theory of resonance phenomena in ferromagnetics 59 10. Spin dynamics in the ferromagnetic resonance science. Evolution of ferromagnetic and spinwave resonances with crystalline order in thin films of fullheusler alloy co2mnsi j. Ferromagnetic resonance fmr technique was initially applied to ferromagnetic materials, all magnetic materials and unpaired electron systems. The resonant frequency is an important parameter in their operation, which is generally determined by the. Ferromagneticresonance of singlecrystal yiggadolinium. Pdf high frequency ferromagnetic resonance measurements.
Ferromagnetic resonance, or fmr, is a spectroscopic technique to probe the magnetization of ferromagnetic materials. Size dependence of ferromagnetic resonance frequency in. Frequencyswept ferromagnetic resonance characterization. Nov 23, 2015 tunable zerofield ferromagnetic resonance frequency in wide range is very useful for the application of microwave devices. 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.
The fmr measurements were performed by a vector network analyzer vna technique with scanning frequency at a speci. The llg equation including the spintransfer torque term, and the frequency spectrum analysis method are used to study the dynamic process of ferromagnetic resonance. 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. Ferromagnetic resonance and damping properties of cofeb thin. Ferromagnetic resonance investigations on ni nanowires are reported. Basically, it is analogous to the electron paramagnetic resonance epr. Ferromagnetic resonance study of thicknessdependent. Kent1,a 1department of physics, new york university, new york, new york 3, usa 2ibm t.
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. Ferromagnetic resonance and damping properties of cofeb. This microwave ferromagnetic resonance apparatus is an experimental instrument for measuring the ferromagnetic resonance curve of ferromagnetic samples. Acoustically driven ferromagnetic resonance for device. Ferromagnetic resonance on ni nanowire arrays journal of. As a rule, the observation of fmr needs the application of an external d. Ferromagnetic resonance study of sputtered co ni multilayers. V download it once and read it on your kindle device, pc, phones or tablets. Dynamic magnetic susceptibility and electrical detection. The phenomenon of resonant absorption of a highfrequency magnetic field in ferromagnetic substances kindle edition by vonsovskii, s. Ferromagnetic resonance an overview sciencedirect topics. Ferromagnetic resonance of a yig film in the low frequency regime seongjae lee,1 scott grudichak,2 joseph sklenar,2 c. Use features like bookmarks, note taking and highlighting while reading ferromagnetic resonance.
Spintorque ferromagnetic resonance measurements of. It is a standard tool for probing spin waves and spin dynamics. Pdf nonlinear ferromagnetic resonance in permalloy films. An external magnetic field was applied parallel to the surface of the thin film. 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. Equation of motion for the magnetization of a system of weakly interacting magnetic electron moments 3.
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