Manipulation of competing ferromagnetic and antiferromagnetic domains in exchange-biased nanostructures

Fraile Rodríguez, Arantxa; Basaran, Ali C.; Morales, Rafael; Kovylina, Miroslavna; Llobet, Jordi; Borrisé, Xavier; Marcus, Matthew A.; Scholl, Andreas; Schuller, Ivan K.; Batlle, Xavier; Labarta, Amílcar

doi:10.1103/PhysRevB.92.174417

Title: Manipulation of competing ferromagnetic and antiferromagnetic domains in exchange-biased nanostructures

Journal Article · Fri Nov 20 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.174417· OSTI ID:1378656

Fraile Rodríguez, Arantxa ^[1]; Basaran, Ali C. ^[2]; Morales, Rafael ^[3]; Kovylina, Miroslavna ^[1]; Llobet, Jordi ^[4]; Borrisé, Xavier ^[5]; Marcus, Matthew A. ^[6]; Scholl, Andreas ^[6]; Schuller, Ivan K. ^[2]; Batlle, Xavier ^[1]; Labarta, Amílcar ^[1]

Universitat de Barcelona (Spain). Departament de Fisica Fonamental and Institut de Nanociencia i Nanotecnologia (IN2UB)
University of California San Diego, La Jolla, CA (United States). Department of Physics and Center for Advanced Nanoscience
University of the Basque Country, Leioa (Spain). Department of Chemical-Physics, BCMaterials; IKERBASQUE, Basque Foundation for Science (Spain)
Institut de Microelectronica de Barcelona (Spain)
Institut Catala de NanociÃ¨ncia i Nanotecnologia (Spain)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

In this work, using photoemission electron microscopy combined with x-ray magnetic circular dichroism we show that a progressive spatial confinement of a ferromagnet (FM), either through thickness variation or laterally via patterning, actively controls the domains of uncompensated spins in the antiferromagnet (AF) in exchange-biased systems. Direct observations of the spin structure in both sides of the FM/AF interface in a model system, Ni/FeF₂, show that the spin structure is determined by the balance between the competing FM and AF magnetic energies. Coexistence of exchange bias domains, with opposite directions, can be established in Ni/FeF₂ bilayers for Ni thicknesses below 10 nm. Patterning the Ni/FeF₂ heterostructures with antidots destabilizes the FM state, enhancing the formation of opposite exchange bias domains below a critical antidot separation of the order of a few FeF₂ crystal domains. The results suggest that dimensional confinement of the FM may be used to manipulate the AF spin structure in spintronic devices and ultrahigh-density information storage media. Lastly, the underlying mechanism of the uncompensated AF domain formation in Ni/FeF₂ may be generic to other magnetic systems with complex noncollinear FM/AF spin structures.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; FG02-87ER45332

OSTI ID:: 1378656

Alternate ID(s):: OSTI ID: 1226670

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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