Spin pumping through a topological insulator probed by x-ray detected ferromagnetic resonance

被引:17
作者
Figueroa, A. I. [1 ]
Baker, A. A. [1 ,2 ]
Collins-McIntyre, L. J. [2 ]
Hesjedal, T. [2 ]
van der Laan, G. [1 ]
机构
[1] Diamond Light Source, Magnet Spect Grp, Didcot OX11 0DE, Oxon, England
[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
基金
英国工程与自然科学研究理事会;
关键词
X-ray detected ferromagnetic resonance; Spin pumping; Spintronics; Topological insulators; THIN-FILMS; DICHROISM; PRECESSION; TORQUE;
D O I
10.1016/j.jmmm.2015.07.013
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In the field of spintronics, the generation of a pure spin current (without macroscopic charge flow) through spin pumping of a ferromagnetic (FM) layer opens up the perspective of a new generation of dissipation-less devices. Microwave driven ferromagnetic resonance (FMR) can generate a pure spin current that enters adjacent layers, allowing for both magnetization reversal (through spin-transfer torque) and to probe spin coherence in non-magnetic materials. However, standard FMR is unable to probe multilayer dynamics directly, since the measurement averages over the contributions from the whole system. The synchrotron radiation-based technique of x-ray detected FMR (XFMR) offers an elegant solution to this drawback, giving access to element-, site-, and layer-specific dynamical measurements in heterostructures. In this work, we show how XFMR has provided unique information to understand spin pumping and spin transfer torque effects through a topological insulator (TI) layer in a pseudo-spin valve heterostructure. We demonstrate that TIs function as efficient spin sinks, while also allowing a limited dynamic coupling between ferromagnetic layers. These results shed new light on the spin dynamics of this novel class of materials, and suggest future directions for the development of room temperature TI-based spintronics. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:178 / 183
页数:6
相关论文
共 49 条
[1]   Weakly coupled motion of individual layers in ferromagnetic resonance [J].
Arena, D. A. ;
Vescovo, E. ;
Kao, C. -C. ;
Guan, Y. ;
Bailey, W. E. .
PHYSICAL REVIEW B, 2006, 74 (06)
[2]   A compact apparatus for studies of element and phase-resolved ferromagnetic resonance [J].
Arena, D. A. ;
Ding, Y. ;
Vescovo, E. ;
Zohar, S. ;
Guan, Y. ;
Bailey, W. E. .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2009, 80 (08)
[3]   Design and performance of an eight-pole resistive magnet for soft x-ray magnetic dichroism measurements [J].
Arenholz, E ;
Prestemon, SO .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2005, 76 (08) :1-8
[4]   Dc effect in ferromagnetic resonance: Evidence of the spin-pumping effect? [J].
Azevedo, A ;
Leao, LHV ;
Rodriguez-Suarez, RL ;
Oliveira, AB ;
Rezende, SM .
JOURNAL OF APPLIED PHYSICS, 2005, 97 (10)
[5]   Detection of microwave phase variation in nanometre-scale magnetic heterostructures [J].
Bailey, W. E. ;
Cheng, C. ;
Knut, R. ;
Karis, O. ;
Auffret, S. ;
Zohar, S. ;
Keavney, D. ;
Warnicke, P. ;
Lee, J. -S. ;
Arena, D. A. .
NATURE COMMUNICATIONS, 2013, 4
[6]   Spin pumping in Ferromagnet-Topological Insulator-Ferromagnet Heterostructures [J].
Baker, A. A. ;
Figueroa, A. I. ;
Collins-McIntyre, L. J. ;
van der Laan, G. ;
Hesjedal, T. .
SCIENTIFIC REPORTS, 2015, 5
[7]   Longitudinal detection of ferromagnetic resonance using x-ray transmission measurements [J].
Boero, G. ;
Rusponi, S. ;
Kavich, J. ;
Lodi Rizzini, A. ;
Piamonteze, C. ;
Nolting, F. ;
Tieg, C. ;
Thiele, J. -U. ;
Gambardella, P. .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2009, 80 (12)
[8]   Element-resolved x-ray ferrimagnetic and ferromagnetic resonance spectroscopy [J].
Boero, G. ;
Mouaziz, S. ;
Rusponi, S. ;
Bencok, P. ;
Nolting, F. ;
Stepanow, S. ;
Gambardella, P. .
NEW JOURNAL OF PHYSICS, 2008, 10
[9]   Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics [J].
Boero, G. ;
Rusponi, S. ;
Bencok, P. ;
Meckenstock, R. ;
Thiele, J-U. ;
Nolting, F. ;
Gambardella, P. .
PHYSICAL REVIEW B, 2009, 79 (22)
[10]   Spin battery operated by ferromagnetic resonance [J].
Brataas, A ;
Tserkovnyak, Y ;
Bauer, GEW ;
Halperin, BI .
PHYSICAL REVIEW B, 2002, 66 (06) :604041-604044