Excitation of Hypersonic Waves by Ferromagnetic Resonance

Bömmel, H. E.; Dransfeld, Klaus

doi:10.1103/physrevlett.3.83

Cited by 122 publications

(35 citation statements)

References 4 publications

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“…However, just as a ε xy term will give a magnetic anisotropy between [110] and [110] axes (term 1 2 A 2xy ε xy sin 2 θ sin 2φ in Eq. (3)), it is easy to imagine that a ε xz term will give a magnetic anisotropy between [110] and [001] axes, expressed as: 1 2 A 2xz ε xz sin 2θ cos φ. This term was evaluated numerically to A 2xz =80 T (details in Annex C) close to 95 K.…”

Section: Particular Cases: I) Saws Propagating Along (110) Ii) Buriementioning

confidence: 99%

“…During the growth, when atoms are mobile on the surface, nearest-neighbor Mn pairs on the GaAs (001) surface have a lower energy for the [1][2][3][4][5][6][7][8][9][10] direction compared to the [110] 39 .…”

Section: Annex a Magnetic Anisotropy Coefficientsmentioning

confidence: 99%

“…In a large number of ferromagnets, the coupling between strain and magnetization originates from the spinorbit interaction, and was shown early on to be maximum when elastic and magnetic resonance (precession) frequencies match 1 . This effect has been revisited in the light of spintronics applications in the past few years with compelling dynamic experiments in both magnetic semiconductors 2,3 and metals 4 .…”

Section: Introductionmentioning

confidence: 99%

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Irreversible magnetization switching using surface acoustic waves

et al. 2013

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An analytical and numerical approach is developped to pinpoint the optimal experimental conditions to irreversibly switch magnetization using surface acoustic waves (SAWs). The layers are magnetized perpendicular to the plane and two switching mechanisms are considered. In precessional switching, a small in-plane field initially tilts the magnetization and the passage of the SAW modifies the magnetic anisotropy parameters through inverse magneto-striction, which triggers precession, and eventually reversal. Using the micromagnetic parameters of a fully characterized layer of the magnetic semiconductor (Ga,Mn)(As,P), we then show that there is a large window of accessible experimental conditions (SAW amplitude/wave-vector, field amplitude/orientation) allowing irreversible switching. As this is a resonant process, the influence of the detuning of the SAW frequency to the magnetic system's eigenfrequency is also explored. Finally, another -non-resonantswitching mechanism is briefly contemplated, and found to be applicable to (Ga,Mn)(As,P): SAWassisted domain nucleation. In this case, a small perpendicular field is applied opposite the initial magnetization and the passage of the SAW lowers the domain nucleation barrier.

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Section: Particular Cases: I) Saws Propagating Along (110) Ii) Buriementioning

confidence: 99%

Section: Annex a Magnetic Anisotropy Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Irreversible magnetization switching using surface acoustic waves

et al. 2013

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“…In the case of precessional (resonant) switching, two features are necessary: sizable magnetoacoustic coupling (to trigger precession), and a highly nonlinear system (to force wide, noncircular precession needed for magnetization reversal). The first point has already been addressed in ferromagnetic metals, since the 1960s by ac electrical excitation of strain waves [7][8][9][10][11][12], and more recently by optical excitation of acoustic pulses [13,14]. The electrical approach consists in the radio-frequency (rf) excitation of a piezoelectric emitter.…”

Section: Introductionmentioning

confidence: 99%

Surface-acoustic-wave-driven ferromagnetic resonance in (Ga,Mn)(As,P) epilayers

et al. 2014

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International audienceSurface acoustic waves (SAW) were generated on a thin layer of the ferromagnetic semiconductor (Ga,Mn)(As,P). The out-of-plane uniaxial magnetic anisotropy of this dilute magnetic semiconductor is very sensitive to the strain of the layer, making it an ideal test material for the dynamic control of magnetization via magnetostriction. The amplitude and phase of the transmitted SAW during magnetic field sweeps showed a clear resonant behavior at a field close to the one calculated to give a precession frequency equal to the SAW frequency. A resonance was observed from 5 to 85 K, just below the Curie temperature of the layer. A full analytical treatment of the coupled magnetization/acoustic dynamics showed that the magnetostrictive coupling modifies the elastic constants of the material and accordingly the wave-vector solution to the elastic wave equation. The shape and position of the resonance were well reproduced by the calculations, in particular the fact that velocity (phase) variations resonated at lower fields than the acoustic attenuation variations. We suggest one reinterpret SAW-driven ferromagnetic resonance as a form of resonant, dynamic, delta-E effect, a concept usually reserved for static magnetoelastic phenomena

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“…В [36,37] наблюдалось увеличение по глощения поперечных упругих волн частотой 1 ГГц в монокристаллических дисках ЖИГ и в тонких пленках никеля (толщиной порядка 15 акустических длин волн) в определенном диапазоне внешних магнитных полей. Характер ной особенностью этих работ является чрезвычайная малость исследуемых образцов (диски имели диаметр 0,3 см и толщину 0,0125 -0,03 см).…”

Section: экспериментunclassified