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Asymmetric Hysteresis Loops in Co Thin Films

Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, Interaction 1, 33619 Bielefeld, Germany
Institute of Physics—Center for Science and Education, Silesian University of Technology, ul. Konarskiego 22B, 44-100 Gliwice, Poland
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(4), 71;
Received: 23 October 2020 / Revised: 30 October 2020 / Accepted: 4 November 2020 / Published: 5 November 2020
(This article belongs to the Special Issue Magnetic Nanoparticles and Nanodevices)
Asymmetric magnetic hysteresis loops are usually found in exchange bias (EB) systems, typically after field cooling a system below the Néel temperature of an antiferromagnet exchange coupled to a ferromagnet. Alternatively, asymmetric hysteresis loops may occur due to undetected minor loops or in systems with a rotational anisotropy. Here, we report on an exchange bias thin film system MgO(100)/Co/CoO, examined at room temperature, which is far above the blocking temperature, by the magneto-optical Kerr effect (MOKE). While the longitudinal hysteresis loops partly show steps which are well-known from diverse purely ferromagnetic systems, the transverse hysteresis loops exhibit clear asymmetries, similar to exchange biased systems at low temperatures, and unusual transverse magnetization values at saturation. Since minor loops and a rotational anisotropy can be excluded in this case, this asymmetry can possibly be a residue of the exchange bias coupling at lower temperatures. View Full-Text
Keywords: exchange bias; rotatable anisotropy; blocking temperature; minor loops; Co/CoO exchange bias; rotatable anisotropy; blocking temperature; minor loops; Co/CoO
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MDPI and ACS Style

Ehrmann, A.; Blachowicz, T. Asymmetric Hysteresis Loops in Co Thin Films. Condens. Matter 2020, 5, 71.

AMA Style

Ehrmann A, Blachowicz T. Asymmetric Hysteresis Loops in Co Thin Films. Condensed Matter. 2020; 5(4):71.

Chicago/Turabian Style

Ehrmann, Andrea, and Tomasz Blachowicz. 2020. "Asymmetric Hysteresis Loops in Co Thin Films" Condensed Matter 5, no. 4: 71.

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