The Influence of Loop Geometry on the Asymmetric Pinning of Domain Walls in Films with Uniaxial Anisotropy

Izmozherov, I. M.; Baykenov, E. Zh.; Dubovik, M. N.; Filippov, B. N.

doi:10.1134/s0031918x18080057

Cited by 2 publications

(1 citation statement)

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“…In addition to exchange biased samples, clear asymmetric hysteresis loops usually occur only as minor loops [28]. One exception, however, must be mentioned here: While normally magnetic nanostructures do not exhibit a loop shift or asymmetric hysteresis loops, as long as they are not erroneously probed by minor loops, simulations of defects in permalloy strips with uniaxial anisotropy revealed indeed asymmetric loops due to domain wall pinning at these defects [29]. This, again, does not have to be taken into account here.…”

Section: Discussionmentioning

confidence: 80%

Asymmetric Hysteresis Loops in Co Thin Films

Ehrmann

Błachowicz

2020

Condensed Matter

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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.

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Section: Discussionmentioning

confidence: 80%