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Title: Microscopic studies of nonlocal spin dynamics and spin transport (invited)

Abstract

Understanding the behavior of spins coupling across interfaces in the study of spin current generation and transport is a fundamental challenge that is important for spintronics applications. The transfer of spin angular momentum from a ferromagnet into an adjacent normal material as a consequence of the precession of the magnetization of the ferromagnet is a process known as spin pumping. We find that, in certain circumstances, the insertion of an intervening normal metal can enhance spin pumping between an excited ferromagnetic magnetization and a normal metal layer as a consequence of improved spin conductance matching. We have studied this using inverse spin Hall effect and enhanced damping measurements. Scanned probe magnetic resonance techniques are a complementary tool in this context offering high resolution magnetic resonance imaging, localized spin excitation, and direct measurement of spin lifetimes or damping. Localized magnetic resonance studies of size-dependent spin dynamics in the absence of lithographic confinement in both ferromagnets and paramagnets reveal the close relationship between spin transport and spin lifetime at microscopic length scales. Finally, detection of ferromagnetic resonance of a ferromagnetic film using the photoluminescence of nitrogen vacancy spins in neighboring nanodiamonds demonstrates long-range spin transport between insulating materials, indicating the complexity andmore » generality of spin transport in diverse, spatially separated, material systems.« less

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)
Publication Date:
OSTI Identifier:
22402965
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; DAMPING; EXCITATION; FERROMAGNETIC RESONANCE; FERROMAGNETISM; HALL EFFECT; INTERFACES; LAYERS; LIFETIME; MAGNETIZATION; METALS; NITROGEN; NMR IMAGING; PARAMAGNETISM; PHOTOLUMINESCENCE; PUMPING; SPIN; THIN FILMS; VACANCIES

Citation Formats

Adur, Rohan, Du, Chunhui, Cardellino, Jeremy, Scozzaro, Nicolas, Wolfe, Christopher S., Wang, Hailong, Herman, Michael, Bhallamudi, Vidya P., Pelekhov, Denis V., Yang, Fengyuan, and Hammel, P. Chris, E-mail: hammel@physics.osu.edu. Microscopic studies of nonlocal spin dynamics and spin transport (invited). United States: N. p., 2015. Web. doi:10.1063/1.4914053.
Adur, Rohan, Du, Chunhui, Cardellino, Jeremy, Scozzaro, Nicolas, Wolfe, Christopher S., Wang, Hailong, Herman, Michael, Bhallamudi, Vidya P., Pelekhov, Denis V., Yang, Fengyuan, & Hammel, P. Chris, E-mail: hammel@physics.osu.edu. Microscopic studies of nonlocal spin dynamics and spin transport (invited). United States. doi:10.1063/1.4914053.
Adur, Rohan, Du, Chunhui, Cardellino, Jeremy, Scozzaro, Nicolas, Wolfe, Christopher S., Wang, Hailong, Herman, Michael, Bhallamudi, Vidya P., Pelekhov, Denis V., Yang, Fengyuan, and Hammel, P. Chris, E-mail: hammel@physics.osu.edu. Thu . "Microscopic studies of nonlocal spin dynamics and spin transport (invited)". United States. doi:10.1063/1.4914053.
@article{osti_22402965,
title = {Microscopic studies of nonlocal spin dynamics and spin transport (invited)},
author = {Adur, Rohan and Du, Chunhui and Cardellino, Jeremy and Scozzaro, Nicolas and Wolfe, Christopher S. and Wang, Hailong and Herman, Michael and Bhallamudi, Vidya P. and Pelekhov, Denis V. and Yang, Fengyuan and Hammel, P. Chris, E-mail: hammel@physics.osu.edu},
abstractNote = {Understanding the behavior of spins coupling across interfaces in the study of spin current generation and transport is a fundamental challenge that is important for spintronics applications. The transfer of spin angular momentum from a ferromagnet into an adjacent normal material as a consequence of the precession of the magnetization of the ferromagnet is a process known as spin pumping. We find that, in certain circumstances, the insertion of an intervening normal metal can enhance spin pumping between an excited ferromagnetic magnetization and a normal metal layer as a consequence of improved spin conductance matching. We have studied this using inverse spin Hall effect and enhanced damping measurements. Scanned probe magnetic resonance techniques are a complementary tool in this context offering high resolution magnetic resonance imaging, localized spin excitation, and direct measurement of spin lifetimes or damping. Localized magnetic resonance studies of size-dependent spin dynamics in the absence of lithographic confinement in both ferromagnets and paramagnets reveal the close relationship between spin transport and spin lifetime at microscopic length scales. Finally, detection of ferromagnetic resonance of a ferromagnetic film using the photoluminescence of nitrogen vacancy spins in neighboring nanodiamonds demonstrates long-range spin transport between insulating materials, indicating the complexity and generality of spin transport in diverse, spatially separated, material systems.},
doi = {10.1063/1.4914053},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}