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Title: Exchange coupling in hybrid anisotropy magnetic multilayers quantified by vector magnetometry

Abstract

Hybrid anisotropy thin film heterostructures, where layers with perpendicular and in-plane anisotropy are separated by a thin spacer, are novel materials for zero/low field spin torque oscillators and bit patterned media. Here, we report on magnetization reversal and exchange coupling in a archetypal Co/Pd (perpendicular)-NiFe (in-plane) hybrid anisotropy system studied using vector vibrating sample magnetometry. This technique allows us to quantify the magnetization reversal in each individual magnetic layer, and measure of the interlayer exchange as a function of non-magnetic spacer thickness. At large (>1 nm) spacer thicknesses Ruderman-Kittel-Kasuya-Yosida-like exchange dominates, with orange-peel coupling providing a significant contribution only for sub-nm spacer thickness.

Authors:
; ;  [1];  [2];  [3]; ;  [4];  [2];  [5]
  1. School of Computer Science, University of Manchester, Manchester M13 9PL (United Kingdom)
  2. Materials Physics, School of ICT, KTH Royal Institute of Technology, Electrum 229, 164 40 Kista (Sweden)
  3. (LNT), VNU-HCM, Ho Chi Minh City (Viet Nam)
  4. Department of Physics, University of Gothenburg, 412 96 Gothenburg (Sweden)
  5. (Sweden)
Publication Date:
OSTI Identifier:
22409965
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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COBALT; COUPLING; HETEROJUNCTIONS; INTERMETALLIC COMPOUNDS; IRON; LAYERS; MAGNETIC FIELD REVERSAL; MAGNETIZATION; NICKEL; OSCILLATORS; PALLADIUM; SPACERS; SPIN; THICKNESS; THIN FILMS; TORQUE; VECTORS

Citation Formats

Morrison, C., E-mail: C.Morrison.2@warwick.ac.uk, Miles, J. J., Thomson, T., Anh Nguyen, T. N., Spintronics Research Group, Laboratory for Nanotechnology, Fang, Y., Dumas, R. K., Åkerman, J., and Department of Physics, University of Gothenburg, 412 96 Gothenburg. Exchange coupling in hybrid anisotropy magnetic multilayers quantified by vector magnetometry. United States: N. p., 2015. Web. doi:10.1063/1.4917336.
Morrison, C., E-mail: C.Morrison.2@warwick.ac.uk, Miles, J. J., Thomson, T., Anh Nguyen, T. N., Spintronics Research Group, Laboratory for Nanotechnology, Fang, Y., Dumas, R. K., Åkerman, J., & Department of Physics, University of Gothenburg, 412 96 Gothenburg. Exchange coupling in hybrid anisotropy magnetic multilayers quantified by vector magnetometry. United States. doi:10.1063/1.4917336.
Morrison, C., E-mail: C.Morrison.2@warwick.ac.uk, Miles, J. J., Thomson, T., Anh Nguyen, T. N., Spintronics Research Group, Laboratory for Nanotechnology, Fang, Y., Dumas, R. K., Åkerman, J., and Department of Physics, University of Gothenburg, 412 96 Gothenburg. Thu . "Exchange coupling in hybrid anisotropy magnetic multilayers quantified by vector magnetometry". United States. doi:10.1063/1.4917336.
@article{osti_22409965,
title = {Exchange coupling in hybrid anisotropy magnetic multilayers quantified by vector magnetometry},
author = {Morrison, C., E-mail: C.Morrison.2@warwick.ac.uk and Miles, J. J. and Thomson, T. and Anh Nguyen, T. N. and Spintronics Research Group, Laboratory for Nanotechnology and Fang, Y. and Dumas, R. K. and Åkerman, J. and Department of Physics, University of Gothenburg, 412 96 Gothenburg},
abstractNote = {Hybrid anisotropy thin film heterostructures, where layers with perpendicular and in-plane anisotropy are separated by a thin spacer, are novel materials for zero/low field spin torque oscillators and bit patterned media. Here, we report on magnetization reversal and exchange coupling in a archetypal Co/Pd (perpendicular)-NiFe (in-plane) hybrid anisotropy system studied using vector vibrating sample magnetometry. This technique allows us to quantify the magnetization reversal in each individual magnetic layer, and measure of the interlayer exchange as a function of non-magnetic spacer thickness. At large (>1 nm) spacer thicknesses Ruderman-Kittel-Kasuya-Yosida-like exchange dominates, with orange-peel coupling providing a significant contribution only for sub-nm spacer thickness.},
doi = {10.1063/1.4917336},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}