Ultrafast laser-induced changes of the magnetic anisotropy in a low-symmetry iron garnet film

Shelukhin, L. A.; Павлов, В. В.; Usachev, P. A.; Shamray, P. Yu.; Pisarev, R. V.; Kalashnikova, A.M.

doi:10.1103/physrevb.97.014422

Cited by 48 publications

(54 citation statements)

References 72 publications

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“…Good agreement between the experimental data and the calculated one confirms that the MCA in the opticallyexcited (311)-(Fe,Ga) film is indeed modified and, thus, triggers the precession, via two distinct mechanisms. At relatively low fields the heat-induced change of anisotropy parameters is efficient, as was also shown in a number of previous works [23,32]. In addition, optically-generated strain modifies MCA via inverse magnetostriction.…”

Section: Magnetization Dynamics In (311) Galfenol Film Induced By Dirsupporting

confidence: 71%

“…Therefore, laser-induced lattice heating results in decrease of MCA parameters. Importantly, this mechanism is expected to be efficient if magnetization is not aligned along the magnetic field [31,32]. This can be realized by applying magnetic field of moderate strength along the hard magnetization axis.…”

Section: Thermal and Strain-induced Control Of The Magnetic Anisotropmentioning

confidence: 99%

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The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film

et al. 2017

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Dynamical strain generated upon excitation of a metallic film by a femtosecond laser pulse may become a versatile tool enabling control of magnetic state of thin films and nanostructures via inverse magnetostriction on a picosecond time scale. Here we explore two alternative approaches to manipulate magnetocrystalline anisotropy and excite magnetization precession in a low-symmetry film of a magnetic metallic alloy galfenol (Fe,Ga) either by injecting picosecond strain pulse into it from a substrate or by generating dynamical strain of complex temporal profile in the film directly. In the former case we realize ultrafast excitation of magnetization dynamics solely by strain pulses. In the latter case optically-generated strain emerged abruptly in the film modifies its magnetocrystalline anisotropy, competing with heat-induced change of anisotropy parameters. We demonstrate that the optically-generated strain remains efficient for launching magnetization precession, when the heat-induced changes of anisotropy parameters do not trigger the precession anymore. We emphasize that in both approaches the ultrafast change of magnetic anisotropy mediating the precession excitation relies on mixed, compressive and shear, character of the dynamical strain, which emerges due to low-symmetry of the metallic film under study.

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Section: Magnetization Dynamics In (311) Galfenol Film Induced By Dirsupporting

confidence: 71%

Section: Thermal and Strain-induced Control Of The Magnetic Anisotropmentioning

confidence: 99%

The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film

et al. 2017

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“…A large magnetooptical contrast is achieved by bismuth substitution [28], which connects this workhorse of magnon spintronics [29,30] and spin caloritronics [31] to optomagnetism. Recent publications on ferrimagnetic garnets reported magnetization dynamics via thermally induced crystalline anisotropy modification [23,32,33], similar to previous work in antiferromagnets [34][35][36]. More specifically, optically excited coherent and incoherent phonons are reported to generate spin waves (SWs) [27,37,38].…”

supporting

confidence: 75%

Measurement of transient strain induced by two-photon excitation

Zeuschner

Pudell

Reppert

et al. 2020

Phys. Rev. Research

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By ultrafast x-ray diffraction we quantify the strain from coherent and incoherent phonons generated by one-and two-photon absorption. We investigated the ferrimagnetic insulator bismuth-doped yttrium iron garnet, which is a workhorse for laser-induced spin dynamics that may be excited indirectly via phonons. We identify the two-photon absorption by the quadratic intensity dependence of the transient strain and confirm a short lifetime of the intermediate state via the inverse proportional dependence on the pump-pulse duration. We determine the two-photon absorption coefficient using the linear relation between strain and absorbed energy density. For large intensities of about 1 TW/cm 2 considerable strain amplitudes of 0.1% are driven exclusively by two-photon absorption.

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“…The inverse Faraday effect (IFE) provides a new way for efficient control of spins at GHz and THz rates 1 . Circularly polarized laser pulses can induce the IFE effective magnetic field of about 10 2 -10 4 Oe in a magnetic dielectric and excite the magnetization precession leading to magnetostatic spin waves [9][10][11][12][13][14][15][16][17][18] . By now, the IFE has been investigated only in a freestanding crystals and films on a substrate.…”

Section: Introductionmentioning

confidence: 99%

Giant peak of the Inverse Faraday effect in the band gap of magnetophotonic microcavity

Kozhaev¹,

Chernov²,

Sylgacheva³

et al. 2018

Sci Rep

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Optical impact on the spin system in a magnetically ordered medium provides a unique possibility for local manipulation of magnetization at subpicosecond time scales. One of the mechanisms of the optical manipulation is related to the inverse Faraday effect (IFE). Usually the IFE is observed in crystals and magnetic films on a substrate. Here we demonstrate the IFE induced by fs-laser pulses in the magnetic film inside the magnetophotonic microcavity. Spectral dependence of the IFE on the laser pulse wavelength in the band gap of the magnetophotonic microcavity has a sharp peak leading to a significant enhancement of the IFE. This phenomenon is explained by strong confinement of the electromagnetic energy within the magnetic film. Calculated near field distribution of the IFE effective magnetic field indicates its subwavelength localization within 30 nm along the film thickness. These excited volumes can be shifted along the sample depth via e.g. changing frequency of the laser pulses. The obtained results open a way for ultrafast optical control of magnetization at subwavelength scales.

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Ultrafast laser-induced changes of the magnetic anisotropy in a low-symmetry iron garnet film

Cited by 48 publications

References 72 publications

The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film

The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film

Measurement of transient strain induced by two-photon excitation

Giant peak of the Inverse Faraday effect in the band gap of magnetophotonic microcavity

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