Role of electron scattering in the magnetization relaxation of thin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>81</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>19</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>films

Ingvarsson, Snorri; Ritchie, Lance; Liu, X. Y.; Xiao, Gang; Slonczewski, J. C.; Trouilloud, P. L.; Koch, R. H.

doi:10.1103/physrevb.66.214416

Cited by 109 publications

(75 citation statements)

References 24 publications

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“…The magnitudes of a and the doping dependence are consistent with Gilbert damping constants in conventional transition metal ferromagnets. In metals, a typically increases with increasing resistivity and is enhanced in alloys with enhanced spin-orbit coupling [42][43][44] . Similarly, in our measurements in (Ga,Mn)As, the increase of a correlates with a sizable increase of the resistivity in the lower Mn-doped samples.…”

Section: Resultsmentioning

confidence: 99%

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

et al. 2013

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(Ga,Mn)As is at the forefront of spintronics research exploring the synergy of ferromagnetism with the physics and the technology of semiconductors. However, the electronic structure of this model spintronics material has been debated and the systematic and reproducible control of the basic micromagnetic parameters and semiconducting doping trends has not been established. Here we show that seemingly small departures from the individually optimized synthesis protocols yield non-systematic doping trends, extrinsic charge and moment compensation, and inhomogeneities that conceal intrinsic properties of (Ga,Mn)As. On the other hand, we demonstrate reproducible, well controlled and microscopically understood semiconducting doping trends and micromagnetic parameters in our series of carefully optimized epilayers. Hand-in-hand with the optimization of the material synthesis, we have developed experimental capabilities based on the magneto-optical pumpand-probe method that allowed us to simultaneously determine the magnetic anisotropy, Gilbert damping and spin stiffness constants from one consistent set of measured data.

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Section: Resultsmentioning

confidence: 99%

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

et al. 2013

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“…Mizukami et al 14 and Invarsson et al 15 investigated the FMR linewidth in Py films which were surrounded by NM layers. In both cases they observed an interface damping.…”

Section: ͑9͒mentioning

confidence: 99%

“…10 and ranges between 1 and 2ϫ10 15 for d NM Ӷ s f one obtains a perfect spin sink ͑equivalent to t NM ϭ0) and for a large Cu thickness there is no difference between the Cu/ perfect-sink and Cu/ perfect-mirror.…”

Section: ͑9͒mentioning

confidence: 99%

Semiclassical theory of spin transport in magnetic multilayers

Urban

Heinrich

Woltersdorf

2003

Journal of Applied Physics

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A semiclassical model of the spin momentum transfer in ferromagnetic film ͑FM͒/normal metal ͑NM͒ structures is presented. It is based on the Landau-Lifshitz equation of motion and the exchange interaction in FM, and on the spin diffusion equation in NM. The internal magnetic field is treated by employing Maxwell's equations. A precessing magnetization in FM creates a spin current which is described by spin pumping proposed by Tserkovnyak et al. In our recent ferromagnetic resonance ͑FMR͒ studies [1][2][3][4] it was shown that the transfer of the spin momentum across ferromagnetic ͑FM͒/normal metal ͑NM͒ interfaces can result in nonlocal interface Gilbert damping GЈ. The generation of spin momentum in magnetic ultrathin films was theoretically described by Tserkovnyak et al. 5 and the effect was called ''spin pumping.'' The presence of a second magnetic layer creates a spin sink. 3,4,6,7 The combination of spin pump and spin sink in the ballistic limit leads to an additional interface Gilbert damping. In this article we extend the spin pump and spin sink mechanisms to the nonballistic electron transport which includes a full treatment of the Landau-Lifshitz ͑LL͒ equation of motion in FM and diffusion equation in NM and Maxwell's equations accounting for a finite penetration of the rf fields.The coordinate system was chosen in such a way that the sample normal is parallel to the z axis. The external dc field, H, lies in the sample plane and is parallel to the y axis, and the internal electromagnetic rf fields are hϭ(h,0,0), e ϭ(0,e,0). The LL equations of motion in FM and NM layers can be written aswhere ␥ is the absolute value of the electron gyromagnetic ratio, M s is the saturation magnetization of FM, G 0 is the intrinsic Gilbert damping, D is the diffusion constant in NM (Dϭv F 2 el /6, v F is the Fermi velocity and el is the electron momentum relaxation time͒, s f is the spin-flip relaxation time, and ␦M N ϭM N Ϫ P h is the excess magnetization in NM, where P is the Pauli susceptibility. The effective field H eff F is derived from the total Gibbs free energy which contains the external fields, magnetocrystaline anisotropies, and exchange interaction. 8 The effective field H eff N in NM contains only the external dc, internal field H, and the demagnetizing field perpendicular to the sample plane. Equations ͑1͒ and ͑2͒ were solved in a small angle approximation using

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“…61,62,63 This effect has been confirmed by experiments. 64,65,66,67 The torque density due to spin-pumping is given by Tserkovnyak et al 48 as…”

Section: F Spin Pumpingmentioning

confidence: 99%

Macrospin models of spin transfer dynamics

2005

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The current-induced magnetization dynamics of a spin valve are studied using a macrospin (single domain) approximation and numerical solutions of a generalized Landau-Lifshitz-Gilbert equation. (2003)], we calculate the resistance and microwave power as a function of current and external field including the effects of anisotropies, damping, spin-transfer torque, thermal fluctuations, spin-pumping, and incomplete absorption of transverse spin current. While many features of experiment appear in the simulations, there are two significant discrepancies: the current dependence of the precession frequency and the presence/absence of a microwave quiet magnetic phase with a distinct magnetoresistance signature. Comparison is made with micromagnetic simulations designed to model the same experiment.

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Role of electron scattering in the magnetization relaxation of thinNi81Fe19films

Cited by 109 publications

References 24 publications

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

Semiclassical theory of spin transport in magnetic multilayers

Macrospin models of spin transfer dynamics

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