Electromagnetic Theory of dc Effects in Ferromagnetic Resonance

Juretschke, H. J.

doi:10.1063/1.1735851

Cited by 117 publications

(94 citation statements)

References 14 publications

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“…In magnetic resonance, the high-frequency precession of the magnetization induces a high-frequency oscillation of ρ at the same frequency f MW as J c , which generates a dc rectification voltage [27] (V SMR ). In contrast to the symmetric line shape of V SP , V SMR also depends on the specifics of the phase relation between microwave current and magnetization precession [28], such that both symmetric and antisymmetric resonance line shapes are possible.…”

Section: Theorymentioning

confidence: 99%

Current-induced spin torque resonance of a magnetic insulator

et al. 2015

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We report the observation of current-induced spin torque resonance in yttrium iron garnet/platinum bilayers. An alternating charge current at GHz frequencies in the platinum gives rise to dc spin pumping and spin Hall magnetoresistance rectification voltages, induced by the Oersted fields of the ac current and the spin Hall effect-mediated spin transfer torque. In ultrathin yttrium iron garnet films, we observe spin transfer torque actuated magnetization dynamics which are significantly larger than those generated by the ac Oersted field. Spin transfer torques thus efficiently couple charge currents and magnetization dynamics also in magnetic insulators, enabling charge current-based interfacing of magnetic insulators with microwave devices.

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Section: Theorymentioning

confidence: 99%

Current-induced spin torque resonance of a magnetic insulator

et al. 2015

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“…Excitation of ferromagnetic resonance (FMR) in ferromagnetic metals (FM) results in several interesting spin-charge effects, such as a change in electrical resistance [1][2][3][4][5][6], appearance of dc electromotive force (the resonance e.m.f. effect) [1,2,[7][8][9][10], and flowing of pure spin current across the interface of FM with adjacent non-magnetic ("normal") metal (NM) [9,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Resonance spin–charge phenomena and mechanism of magnetoresistance anisotropy in manganite/metal bilayer structures

Ацаркин¹,

Sorokin²,

Borisenko³

et al. 2016

J. Phys. D: Appl. Phys.

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The dc voltage generated under ferromagnetic resonance has been studied in bilayer structures based on manganite thin epitaxial films La 0.67 Sr 0.33 MnO 3 (LSMO) and non-magnetic metals (Au, Pt, and SrRuO 3 ) in the temperature range up to the Curie point. The effect is shown to be caused by two different phenomena: (1) the resonance dc electromotive force related to anisotropic magnetoresistance (AMR) in the manganite film and (2) pure spin current (spin pumping) registered by means of the inverse spin Hall effect in normal metal. The two phenomena were separated using the angular dependence of the effect, the external magnetic field H 0 being rotated in the film plane. It was found that the AMR mechanism in the manganite films differs substantially from that in traditional ferromagnetic metals being governed by the colossal magnetoresistance together with the in-plane magnetic anisotropy. The spin pumping effect registered in the bilayers was found to be much lower than that reported for common ferromagnets; possible reasons are discussed.

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“…Magnetization dynamics under FMR also produces d.c. voltage in the ferromagnetic layer through galvanomagnetic effects, that is, anisotropic magnetoresistance and anomalous Hall effect (AHE) [24][25][26] . These effects have often been neglected in the quantitative analyses on the observed d.c. voltage generated in a non-magnetic layer next to a ferromagnetic layer under FMR; the non-negligible contribution of these effects was pointed out only recently 22,23,27 .…”

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confidence: 99%

Direct-current voltages in (Ga,Mn)As structures induced by ferromagnetic resonance

2013

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Spin pumping is the phenomenon that magnetization precession in a ferromagnetic layer under ferromagnetic resonance produces a pure spin current in an adjacent non-magnetic layer. The pure spin current is converted to a charge current by the spin-orbit interaction, and produces a d.c. voltage in the non-magnetic layer, which is called the inverse spin Hall effect. The combination of spin pumping and inverse spin Hall effect has been utilized to determine the spin Hall angle of the non-magnetic layer in various ferromagnetic/non-magnetic systems. Magnetization dynamics of ferromagnetic resonance also produces d.c. voltage in the ferromagnetic layer through galvanomagnetic effects. Here we show a method to separate voltages of different origins using (Ga,Mn)As/p-GaAs as a model system, where sizable galvanomagnetic effects are present. Neglecting the galvanomagnetic effects can lead to an overestimate of the spin Hall angle by factor of 8, indicating that separating the d.c. voltages of different origins is critical.

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Electromagnetic Theory of dc Effects in Ferromagnetic Resonance

Cited by 117 publications

References 14 publications

Current-induced spin torque resonance of a magnetic insulator

Current-induced spin torque resonance of a magnetic insulator

Resonance spin–charge phenomena and mechanism of magnetoresistance anisotropy in manganite/metal bilayer structures

Direct-current voltages in (Ga,Mn)As structures induced by ferromagnetic resonance

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