Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states

Mizukami, Shigemi; Watanabe, Dai; Oogane, Mikihiko; Ando, Yasuo; Miura, Yoshio; Shirai, Masamitsu; Miyazaki, T.

doi:10.1063/1.3067607

Cited by 252 publications

(173 citation statements)

References 19 publications

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“…39 The inhomogeneous line broadening is found to be small for our LSMO films ∆H inh = 1.3 Oe, with a negligible mosaicity contribution ≤ 0.7 Oe. Next, we study the effect of adding a Pt capping layer to LSMO films.…”

Section: -5mentioning

confidence: 99%

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

et al. 2016

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We report ferromagnetic resonance measurements of magnetic anisotropy and damping in epitaxial La0.7Sr0.3MnO3 (LSMO) and Pt capped LSMO thin films on SrTiO3 (001) substrates. The measurements reveal large negative perpendicular magnetic anisotropy and a weaker uniaxial in-plane anisotropy that are unaffected by the Pt cap. The Gilbert damping of the bare LSMO films is found to be low α = 1.9(1) × 10−3, and two-magnon scattering is determined to be significant and strongly anisotropic. The Pt cap increases the damping by 50% due to spin pumping, which is also directly detected via inverse spin Hall effect in Pt. Our work demonstrates efficient spin transport across the Pt/LSMO interface.

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Section: -5mentioning

confidence: 99%

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

et al. 2016

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“…The magnetic and half-metallic properties of Heusler alloys depend crucially on the atomic order [27][28][29][30][31][32], as mentioned above: true half-metallicity with a spin polarization of 100% is theoretically predicted only for perfect longrange L2 1 crystal structure. Therefore, the preparation of Heusler alloy thin films with L2 1 crystal structure is of utmost importance for optimizing the performance of Heusler alloys in spintronic devices.…”

Section: Introductionmentioning

confidence: 99%

Thin films of the Heusler alloys Cu₂MnAl and Co₂MnSi: recovery of ferromagnetism via solid-state crystallization from the x-ray amorphous state

Erb¹,

Nowak²,

Westerholt³

et al. 2010

J. Phys. D: Appl. Phys.

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X-ray amorphous thin films of the Heusler alloys Cu 2 MnAl and Co 2 MnSi have been prepared by magnetron sputter deposition at room temperature. In the amorphous state the Cu 2 MnAl phase is non-ferromagnetic; Co 2 MnSi is weakly ferromagnetic with a ferromagnetic Curie temperature of 170 K. By solid-state crystallization at high temperatures strong ferromagnetic order and high Curie temperatures are established in both alloys. The saturation magnetization of the Co 2 MnSi alloy reaches 5.1µ B /f.u. at 4 K, corresponding to 100% of the theoretical value; for Cu 2 MnAl we obtain 2.8µ B /f.u. at 4 K, which corresponds to 87.5% of the theoretical value. In samples of the Co 2 MnSi phase with optimum saturation magnetization Bragg reflections as indicators of a long-range chemical order are missing, whereas for the Cu 2 MnAl phase Bragg reflections confirm epitaxial quality and long-range L2 1 order.

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“…The damping parameter determines the length scales over which spin waves can propagate, the critical current density for STT excitation [91][92][93] and the fidelity of communication and data processing devices that exploit the resonant mode spectrum. Reduced damping parameters of a = 0.001 have been realized in half-metallic materials [94,95], where spin-flip scattering is thought to be suppressed, while V doping has been observed to reduce the damping parameter of the highest quality Fe films [96]. Therefore, future spintronic devices may be constructed from epitaxial thin-film materials, as in the semiconductor industry today, which also provide opportunities to more fully control and exploit magnetic anisotropy.…”

Section: Further Investigation and Exploitation Of Magnetization Dynamentioning

confidence: 99%

Ultrafast magnetization dynamics of spintronic nanostructures

Keatley

Kruglyak

Gangmei

et al. 2011

Phil. Trans. R. Soc. A.

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The ultrafast (sub-nanosecond) magnetization dynamics of ferromagnetic thin films and elements that find application in spintronic devices is reviewed. The major advances in the understanding of magnetization dynamics in the two decades since the discovery of giant magnetoresistance and the prediction of spin-transfer torque are discussed, along with the plethora of new experimental techniques developed to make measurements on shorter length and time scales. Particular consideration is given to time-resolved measurements of the magneto-optical Kerr effect, and it is shown how a succession of studies performed with this technique has led to an improved understanding of the dynamics of nanoscale magnets. The dynamics can be surprisingly rich and complicated, with the latest studies of individual nanoscale elements showing that the dependence of the resonant mode spectrum upon the physical structure is still not well understood. Finally, the article surveys the prospects for development of high-frequency spintronic devices and highlights areas in which further study of fundamental properties will be required within the coming decade.

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Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states

Cited by 252 publications

References 19 publications

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

Thin films of the Heusler alloys Cu₂MnAl and Co₂MnSi: recovery of ferromagnetism via solid-state crystallization from the x-ray amorphous state

Ultrafast magnetization dynamics of spintronic nanostructures

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Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states

Cited by 252 publications

References 19 publications

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

Thin films of the Heusler alloys Cu2MnAl and Co2MnSi: recovery of ferromagnetism via solid-state crystallization from the x-ray amorphous state

Ultrafast magnetization dynamics of spintronic nanostructures

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Thin films of the Heusler alloys Cu₂MnAl and Co₂MnSi: recovery of ferromagnetism via solid-state crystallization from the x-ray amorphous state