Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures

Procter, R. A.; Magnus, F.; Andersson, G.; Sánchez-Hanke, C.; Hjörvarsson, B.; Hase, T. P. A.

doi:10.1063/1.4928632

Title: Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures

Journal Article · Mon Aug 10 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4928632· OSTI ID:1229199

^[1]; Magnus, F. ^[2];

^[2]; Sánchez-Hanke, C. ^[3];

^[2];

^[1]

Univ. of Warwick, Coventry (United Kingdom)
Uppsala Univ. (Sweden)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: 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

Grant/Contract Number:: SC00112704; AC02-98CH10886; AC02-06CH11357

OSTI ID:: 1229199

Alternate ID(s):: OSTI ID: 1229609

Report Number(s):: BNL-111274-2015-JA; APPLAB

Journal Information:: Applied Physics Letters, Vol. 107, Issue 6; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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References (26)

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36 MATERIALS SCIENCE
Magnetic materials
Magnetic hysteresis
Magnetic ordering
Alloys
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X-ray scattering
Magnetic devices
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Title: Magnetic leverage effects in amorphous SmCo/CoAlZr heterostructures

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