Theory of magnetization precession induced by a picosecond strain pulse in ferromagnetic semiconductor (Ga,Mn)As

Linnik, T. L.; Scherbakov, A. V.; Yakovlev, D. R.; Liu, X.; Furdyna, J. K.; Bayer, М.

doi:10.1103/physrevb.84.214432

Cited by 35 publications

(42 citation statements)

References 41 publications

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“…4(c)] (M x → M x and M y → −M y , which is equivalent to φ → −φ), the direction of magnetization precession changes in accordance with the above equation. We note that the foregoing discussion on magnetoelasticity is related to a myriad of other ultrafast [17][18][19][20][21][22] work as well as its connection to quasistatic straintronics [23,24].…”

Section: Experimental Techniquementioning

confidence: 99%

Ultrafast magnetoelastic probing of surface acoustic transients

et al. 2016

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We generate in-plane magnetoelastic waves in nickel films using the all-optical transient grating technique. When performed on amorphous glass substrates, two dominant magnetoelastic excitations can be resonantly driven by the underlying elastic distortions, the Rayleigh surface acoustic wave and the surface skimming longitudinal wave. An applied field, oriented in the sample plane, selectively tunes the coupling between magnetic precession and one of the elastic waves, thus demonstrating selective excitation of coexisting, large-amplitude magnetoelastic waves. Analytical calculations based on the Green's function approach corroborate the generation of multiple surface acoustic transients with disparate decay dynamics.

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Section: Experimental Techniquementioning

confidence: 99%

Ultrafast magnetoelastic probing of surface acoustic transients

et al. 2016

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“…We will therefore stick to the ε xy,0 =10 −4 value used in Ref. 12, and deduce from our experimental value B 2// = -1.2 mT the parameter A 2xy =-12 T 13 .…”

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

confidence: 99%

“…al 12 , a normalized free energy density F M =F/M s is defined, where F is a very general form of the free energy density of a cubic ferromagnetic layer distorted by strain:…”

Section: Magnetic Systemmentioning

confidence: 99%

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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“…[34] the detailed theory of strain-pulse induced magnetization precession in the ferromagnetic film was developed. We applied here the similar approach allowing additional mechanisms of precession driving by the laser pulse.…”

Section: Appendix B Laser-pulse Induced Magnetization Precessionmentioning

confidence: 99%

“…In the linear-response limit, the simple analytical solution describing the free magnetization precession can be written [34]:…”

Section: Appendix B Laser-pulse Induced Magnetization Precessionmentioning

confidence: 99%

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films

et al. 2016

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. (2016) Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films. Physical Review B, 93 (21 A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. ABSTRACTUltrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of non-coherent phonons, which modifies the temperature dependent parameters of the magneto-crystalline anisotropy; and coherent phonons in the form of a strain contributing via inverse magnetostriction. Contrary to the earlier experiments with high symmetry ferromagnetic structures, where these mechanisms could not be separated, we study the magnetization response to femtosecond optical pulses in the low-symmetry magnetostrictive Galfenol film so that it is possible to separate the coherent and non-coherent phonon contributions. By choosing certain experimental geometry and external magnetic field, we can distinguish the contribution from a specific mechanism. Theoretical analysis and numerical calculations are used to support the experimental observations and proposed model.

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Theory of magnetization precession induced by a picosecond strain pulse in ferromagnetic semiconductor (Ga,Mn)As

Cited by 35 publications

References 41 publications

Ultrafast magnetoelastic probing of surface acoustic transients

Ultrafast magnetoelastic probing of surface acoustic transients

Irreversible magnetization switching using surface acoustic waves

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films

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