Ultrafast optical modification of magnetic anisotropy and stimulated precession in an epitaxial Co2MnAl thin film

Liu, Y.; Shelford, L. R.; Kruglyak, V. V.; Hicken, R. J.; Sakuraba, Yuya; Oogane, Mikihiko; Ando, Yasuo; Miyazaki, T.

doi:10.1063/1.2711702

Cited by 34 publications

(34 citation statements)

References 20 publications

(22 reference statements)

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“…As a final example, the relaxation properties of Co 2 MnAl were investigated by all-optical FMR [105]. In this case, a comprehensive study of the relaxation at various frequencies was achieved by varying the applied magnetic field.…”

Section: Magnetic Dampingmentioning

confidence: 99%

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Trudel

Gaier

Hamrle

et al. 2010

J. Phys. D: Appl. Phys.

222

144

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* Cobalt-based full-Heusler compounds with composition Co2M′ Z (where M ′ is a transition metal and Z is a main group element) are attracting attention due to their predicted half-metallic behaviour, a considerably desired property for spin-dependent electron transport devices. Knowledge of the basic magnetic properties of these materials, in particular in the form of thin films, is required both to fully exploit these promising materials, and to understand their underlying electronic structure and establish structure-property relationships. In this Topical Review, we present a survey of the magnetic anisotropy, exchange, and damping of Co2M ′ Z compounds. These properties are directly related to spin-spin and spin-orbit interactions.

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Section: Magnetic Dampingmentioning

confidence: 99%

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Trudel

Gaier

Hamrle

et al. 2010

J. Phys. D: Appl. Phys.

222

144

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“…Ultrafast heating by laser pulses is used to induce magnetization dynamics through the temperature dependence of the magnetic anisotropy. [26][27][28][29][30] The technique has the advantage of allowing the magnetization dynamics to be studied over a continuous range of frequencies. By fitting the time dependent Kerr signals to a macrospin solution of the Landau-Lifshitz-Gilbert ͑LLG͒ equation, values are obtained for the effective fields acting upon the magnetization and values for the cubic anisotropy constant and total apparent damping parameter are deduced.…”

Section: Introductionmentioning

confidence: 99%

Optically induced magnetization dynamics and variation of damping parameter in epitaxialCo2MnSiHeusler alloy films

et al. 2010

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All-optical pump-probe measurements of magnetization dynamics have been performed upon epitaxial Co 2 MnSi͑001͒ Heusler alloy thin films annealed at temperatures of 300, 400, and 450°C. An ultrafast laserinduced modification of the magnetocrystalline anisotropy triggers precession which is detected by timeresolved magneto-optical Kerr effect measurements. From the damped oscillatory Kerr rotation, the frequency and relaxation rate of the precession is determined. Using a macrospin solution of the Landau-Lifshitz-Gilbert equation the effective fields acting upon the sample magnetization are deduced. This reveals that the magnetization is virtually independent of the annealing temperature while the fourfold magnetocrystalline anisotropy decreases dramatically with increasing annealing temperature as the film structure changes between the B2 and L2 1 phases. From the measured relaxation rates, the value of the apparent Gilbert damping parameter is found to depend strongly upon the static field strength and in-plane static field orientation. The variation of the apparent damping parameter is generally well reproduced by an inhomogeneous broadening model in which the presence of B2 and L2 1 phases leads to a large dispersion of the magnetocrystalline anisotropy. However, for the sample annealed at a temperature of 300°C, the lack of a detailed fit to the data suggests that the apparent anisotropy of the apparent damping parameter might alternatively arise due to a network of dislocations with fourfold symmetry.

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“…17 In some cases, stripe domains have also been seen due to magnetic frustration between two energetically equivalent easy axis. 18 The interface between the film and substrate also affects the orientation of magnetization significantly. For example, the out-of-plane magnetic easy axis in Co 2 FeAl films on Cr-buffered MgO substrate seemed to be induced by the interfacial anisotropy, which appears after annealing the films in the presence of magnetic field applied along out-of-plane direction.…”

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confidence: 99%

Magnetoelastic coupling induced magnetic anisotropy in Co₂(Fe/Mn)Si thin films

et al. 2014

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The influence of epitaxial strain on uniaxial magnetic anisotropy of Co 2 FeSi (CFS) and Co 2 MnSi (CMS) Heusler alloy thin films grown on (001) SrTiO 3 (STO) and MgO is reported. The in-plane biaxial strain is susceptible to tune by varying the thickness of the films on STO, while on MgO the films show in-plane easy axis for magnetization ( − → M ) irrespective of their thickness. A variational analysis of magnetic free energy functional within the Stoner-Wohlfarth coherent rotation model with out-of-plane uniaxial anisotropy for the films on STO showed the presence of magnetoelastic anisotropy with magnetostriction constant ≈ (12.22±0.07)×10 −6 and (2.02±0.06)×10 −6 , in addition to intrinsic magnetocrystalline anisotropy ≈ -1.72×10 6 erg/cm 3 and -3.94×10 6 erg/cm 3 for CFS and CMS, respectively. The single-domain phase diagram reveals a gradual transition from in-plane to out-of-plane orientation of magnetization with the decreasing film thickness. A maximum canting angle of 41.5 • with respect to film plane is predicted for the magnetization of the thinnest (12 nm) CFS film on STO. The distinct behaviour of − → M in the films with lower thickness on STO is attributed to strain-induced tetragonal distortion.

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Ultrafast optical modification of magnetic anisotropy and stimulated precession in an epitaxial Co2MnAl thin film

Cited by 34 publications

References 20 publications

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Optically induced magnetization dynamics and variation of damping parameter in epitaxialCo2MnSiHeusler alloy films

Magnetoelastic coupling induced magnetic anisotropy in Co₂(Fe/Mn)Si thin films

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Ultrafast optical modification of magnetic anisotropy and stimulated precession in an epitaxial Co2MnAl thin film

Cited by 34 publications

References 20 publications

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Optically induced magnetization dynamics and variation of damping parameter in epitaxialCo2MnSiHeusler alloy films

Magnetoelastic coupling induced magnetic anisotropy in Co2(Fe/Mn)Si thin films

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Magnetoelastic coupling induced magnetic anisotropy in Co₂(Fe/Mn)Si thin films