Spin pumping damping and magnetic proximity effect in Pd and Pt spin-sink layers

被引：127
作者：
Caminale, M. [1 ,2 ]
Ghosh, A. [2 ]
Auffret, S. [2 ]
Ebels, U. [2 ]
Ollefs, K. [3 ,4 ]
Wilhelm, F. [5 ]
Rogalev, A. [5 ]
Bailey, W. E. [1 ,6 ]
机构：
[1] Fdn Nanosci, F-38000 Grenoble, France
[2] Univ Grenoble Alpes, CEA, CNRS, SPINTEC, F-38000 Grenoble, France
[3] Univ Duisburg Gesamthsch, Fak Phys, D-47057 Duisburg, Germany
[4] Univ Duisburg Gesamthsch, Ctr Nanointegrat CENIDE, D-47057 Duisburg, Germany
[5] European Synchrotron Radiat Facil, F-38054 Grenoble, France
[6] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 01期
基金：
美国国家科学基金会;
关键词：
CIRCULAR-DICHROISM; FERMI-SURFACE; FILMS; TEMPERATURE; MULTILAYERS; INJECTION; PLATINUM; TORQUE;
D O I：
10.1103/PhysRevB.94.014414
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigated the spin pumping damping contributed by paramagnetic layers (Pd, Pt) in both direct and indirect contact with ferromagnetic Ni81Fe19 films. We find a nearly linear dependence of the interface-related Gilbert damping enhancement Delta alpha on the heavy-metal spin-sink layer thicknesses t(N) in direct-contact Ni81Fe19/(Pd, Pt) junctions, whereas an exponential dependence is observed when Ni81Fe19 and (Pd, Pt) are separated by 3 nm Cu. We attribute the quasilinear thickness dependence to the presence of induced moments in Pt, Pd near the interface with Ni81Fe19, quantified using x-ray magnetic circular dichroism measurements. Our results show that the scattering of pure spin current is configuration-dependent in these systems and cannot be described by a single characteristic length.
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页数：10
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