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Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
Salazar-Alvarez, German (Stockholm University. Department of Materials and Environmental Chemistry)
Julian Geshev (Universitat Autònoma de Barcelona. Departament de Física)
Agramut-Puig, Sebastià (Universitat Autònoma de Barcelona. Departament de Física)
Navau Ros, Carles (Universitat Autònoma de Barcelona. Departament de Física)
Sánchez Moreno, Álvaro (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia)

Date: 2016
Abstract: The exchange bias properties of Co/CoO coaxial core/shell nanowires have been investigated with cooling and applied fields perpendicular to the wire axis. This configuration leads to unexpected exchange-bias effects. Firstly, the magnetization value at high fields is found to depend on the field-cooling conditions. This effect arises from the competition between the magnetic anisotropy and the Zeeman energies for cooling fields perpendicular to the wire axis. This allows imprinting pre-defined magnetization states to the AFM, as corroborated by micromagnetic simulations. Secondly, the system exhibits a high-field magnetic irreversibility, leading to open hysteresis loops, attributed to the AFM easy-axis reorientation during the reversal (effect similar to athermal training). A distinct way to manipulate the high-field magnetization in exchange-biased systems, beyond the archetypical effects, is thus experimentally and theoretically demonstrated.
Note: Número d'acord de subvenció EC/FP7/296679
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Note: Número d'acord de subvenció MINECO/MAT2012-35370
Note: Número d'acord de subvenció AGAUR/2014/SGR-1015
Note: Número d'acord de subvenció AGAUR/2014-SGR-150
Rights: Tots els drets reservats
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Coaxial nanowires ; Exchange bias ; CoO ; Uncopmpensated spins ; Training effects ; High field irreversibility
Published in: ACS applied materials & interfaces, Vol. 8 núm 34 (Agost 2016) , p. 22477-22483

DOI: 10.1021/acsami.6b05588


Post-print
25 p, 524.2 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2017-02-17, last modified 2019-09-23



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