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Title: Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures

Abstract

Although magnetic heterostructures are the basis of many magnetic technologies, the mechanisms involved in magnetization reversals in such structures are not fully understood, especially in amorphous multilayers. Here, we report on the SmCo/CoAlZr system and exploit resonant magnetic x-ray scattering to probe the element specific magnetization reversals. When combined into a tri-layer structure, two different switching fields and reversal mechanisms are observed for the Sm and Co sub-lattices. We argue that the decoupling of the sub-lattices arises from the local distribution of atomic species within the amorphous matrix leading to a strong magnetic leverage effect and exchange pinning. The decoupling arises due to strong interactions between regions of high Co density which span the interface. In conclusion, the relatively sparse interactions between Sm and Co induce a localized pinning of the Co-rich areas, resulting in an exchange bias in minor loops and an enhanced coercivity.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Univ. of Warwick, Coventry (United Kingdom)
  2. Uppsala Univ. (Sweden)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); UK-EPSRC; Swedish Research Council (VR); Knut and Alice Wallenberg Foundation (KAW); Swedish Foundation for International Cooperation in Research and Higher Education (STINT); Carl Trygger Foundation
OSTI Identifier:
1229199
Alternate Identifier(s):
OSTI ID: 1229609
Report Number(s):
BNL-111274-2015-JA
Journal ID: ISSN 0003-6951; APPLAB
Grant/Contract Number:  
SC00112704; AC02-98CH10886; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 6; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnetic materials; Magnetic hysteresis; Magnetic ordering; Alloys; Exchange interactions; X-ray scattering; Magnetic devices; Multilayers; Heterostructures; Magnetic fields

Citation Formats

Procter, R. A., Magnus, F., Andersson, G., Sánchez-Hanke, C., Hjörvarsson, B., and Hase, T. P. A. Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures. United States: N. p., 2015. Web. doi:10.1063/1.4928632.
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Procter, R. A., Magnus, F., Andersson, G., Sánchez-Hanke, C., Hjörvarsson, B., & Hase, T. P. A. Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures. United States. https://doi.org/10.1063/1.4928632
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Procter, R. A., Magnus, F., Andersson, G., Sánchez-Hanke, C., Hjörvarsson, B., and Hase, T. P. A. Mon . "Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures". United States. https://doi.org/10.1063/1.4928632. https://www.osti.gov/servlets/purl/1229199.
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@article{osti_1229199,
title = {Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures},
author = {Procter, R. A. and Magnus, F. and Andersson, G. and Sánchez-Hanke, C. and Hjörvarsson, B. and Hase, T. P. A.},
abstractNote = {Although magnetic heterostructures are the basis of many magnetic technologies, the mechanisms involved in magnetization reversals in such structures are not fully understood, especially in amorphous multilayers. Here, we report on the SmCo/CoAlZr system and exploit resonant magnetic x-ray scattering to probe the element specific magnetization reversals. When combined into a tri-layer structure, two different switching fields and reversal mechanisms are observed for the Sm and Co sub-lattices. We argue that the decoupling of the sub-lattices arises from the local distribution of atomic species within the amorphous matrix leading to a strong magnetic leverage effect and exchange pinning. The decoupling arises due to strong interactions between regions of high Co density which span the interface. In conclusion, the relatively sparse interactions between Sm and Co induce a localized pinning of the Co-rich areas, resulting in an exchange bias in minor loops and an enhanced coercivity.},
doi = {10.1063/1.4928632},
journal = {Applied Physics Letters},
number = 6,
volume = 107,
place = {United States},
year = {Mon Aug 10 00:00:00 EDT 2015},
month = {Mon Aug 10 00:00:00 EDT 2015}
}
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https://doi.org/10.1063/1.4928632
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