Spin-Wave Modes in Exchange-Coupled FePt/FeNi Bilayer Films

Li, Shufa; He, Ping; Cheng, Chuyuan; Zhou, Shiming; Lai, Tianshu

doi:10.1088/0256-307x/31/1/017502

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…[19] Under the bias of an external magnetic field with certain inhomogeneity, besides the Kittel mode, there are also higher-order magnetostatic (HMS) modes in the spin ensemble. [45][46][47] Previous studies often ignored the influence of these magnetostatic modes on the observation and application of Kittel mode in experiments. However, the HMS modes actually have nontrivial spin textures.…”

Section: Introductionmentioning

confidence: 99%

Observation of nonlinearity and heating-induced frequency shifts in cavity magnonics

Qian

et al. 2022

Chinese Phys. B

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When there is a certain amount of field inhomogeneity, the biased ferrimagnetic crystal can exhibit the higher-order magnetostatic (HMS) mode in addition to the uniform-precession Kittel mode. In cavity magnonics, we show the nonlinearity and heating induced frequency shifts of the Kittel mode and HMS mode in a yttrium-iron-garnet (YIG) sphere. When the Kittel mode is driven to generate a certain number of excitations, the temperature of the whole YIG sample rises and the HMS mode can display an induced frequency shift, and vice versa. This cross effect provides a new method to study the magnetization dynamics and paves a way for novel cavity magnonic devices by including the heating effect as an operational degree of freedom.

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Section: Introductionmentioning

confidence: 99%

Observation of nonlinearity and heating-induced frequency shifts in cavity magnonics

Qian

et al. 2022

Chinese Phys. B

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“…Exchange-coupled composites (ECCs) have attracted much interest due to their designable magnetic properties from combining individual material with different properties [1,2] and also potential applications in magnetic recording [3,4], magnetic sensors [5,6] and magnonic devices [7,8]. In particular, many research works focused on the perpendicular ECCs which have high thermal stability, reduced switching field, and thus excellent applied potential for ultrahighdensity magnetic recording [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser Modulation of Local Magnetization Orientation in Perpendicularly Exchange-Coupled Bilayer

et al. 2021

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Laser-induced magnetization dynamics in a perpendicularly exchange-coupled TbFeCo/GdFeCo bilayer film are studied by using pump-probe magneto-optical Kerr spectroscopy. An ultrafast modulation effect on local magnetization orientation is observed. Such ultrafast magnetization reorientation in the GdFeCo layer is revealed to be triggered by the femtosecond laser pulse and driven by the effective exchange field. These processes occur within a timescale of hundreds of picoseconds, in which the field- and fluence-dependent dynamical behaviors are demonstrated. In addition, an atomistic Heisenberg model is proposed for studying the laser-induced magnetization dynamics by using micromagnetic simulation. The simulated results agree with the experimental phenomena and further reveal the underlying mechanism. These results show an approach for ultrafast manipulation of the local magnetization orientation in perpendicularly exchange-coupled structures.

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“…The electron spin might find application in the future to create new logic devices capable of lower power consumption and higher performance. [1][2][3][4][5][6][7][8] Silicon is a very suitable host material for fabricating spintronics devices because it has low atomic weight, lattice inversion symmetry, and relatively long spin relaxation time due to the weak spinorbit interaction and poor electron-nuclear spin coupling. [9][10][11][12][13] Electron spin resonance (ESR) [14][15][16][17][18] is a promising technique for measuring the spin relaxation time because the absorption lineshapes are sensitive to the type of scattering mechanisms affecting the carrier behavior.…”

Section: Introductionmentioning

confidence: 99%

Theory of phonon-modulated electron spin relaxation time based on the projection—reduction method

Kang¹,

Choi²

2014

Chinese Phys. B

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This paper introduces a new method for a formula for electron spin relaxation time of a system of electrons interacting with phonons through phonon-modulated spin-orbit coupling using the projection-reduction method. The phonon absorption and emission processes as well as the photon absorption and emission processes in all electron transition processes can be explained in an organized manner, and the result can be represented in a diagram that can provide intuition for the quantum dynamics of electrons in a solid. The temperature (T ) dependence of electron spin relaxation times (T 1 ) in silicon is T 1 ∝ T −1.07 at low temperatures and T 1 ∝ T −3.3 at high temperatures for acoustic deformation constant P ad = 1.4 × 10 7 eV and optical deformation constant P od = 4.0 × 10 17 eV/m. This means that electrons are scattered by the acoustic deformation phonons at low temperatures and optical deformation phonons at high temperatures, respectively. The magnetic field (B) dependence of the relaxation times is T 1 ∝ B −2.7 at 100 K and T 1 ∝ B −2.3 at 150 K, which nearly agree with the result of Yafet, T 1 ∝ B −3.0 ∼ B −2.5 .

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Spin-Wave Modes in Exchange-Coupled FePt/FeNi Bilayer Films

Cited by 4 publications

References 21 publications

Observation of nonlinearity and heating-induced frequency shifts in cavity magnonics

Observation of nonlinearity and heating-induced frequency shifts in cavity magnonics

Ultrafast Laser Modulation of Local Magnetization Orientation in Perpendicularly Exchange-Coupled Bilayer

Theory of phonon-modulated electron spin relaxation time based on the projection—reduction method

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