Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Magnetic Heuslers, Half-Metals and Oxides (jointly with TT)

MA 42.4: Vortrag

Donnerstag, 10. März 2016, 10:15–10:30, H34

Exchange Bias-Like Effect of an Uncompensated Antiferromagnet — •Bastian Henne, Verena Ney, Mariano de Souza, and Andreas Ney — Johannes Kepler Universität Linz - Austria

Commonly, exchange biasing is evidenced by a field-like horizontal shift of the M(H)-loop dominated by the FM [1]. In contrast, its microscopic origin is attributed to uncompensated spins, i.e., an excess magnetization, of the antiferromagnet (AFM) exchange coupled to the FM [2]. This infers the presence of an additional vertical shift . Experimental observations of this shift are limited to few layered FM/AFM systems (for example [3]) and observations in the absence of a FM are lacking. In this contribution we present antiferromagnetic Co:ZnO as model system in which the uncompensated spins indeed exclusively lead to a vertical shift which is measurable by conventional magnetometry. Our findings pave the way for the exploration of the vertical exchange bias effect in the absence of a FM and the possibility to achieve a finite field-resistant magnetization in an uncompensated AFM.

[1] Nogúes, J. and Schuller, I.K., J. Magn. Magn. Mater. 192, 203 (1999).

[2] Ohldag, H. et al., Phys. Rev. Lett. 91, 017203 (2003).

[3] Rana, R. et al., Sci. Rep. 4, 4138 (2014).