Perpendicular exchange bias in ferrimagnetic spin valves

F. Radu (), R. Abrudan, I. Radu, D. Schmitz and H. Zabel
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F. Radu: Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
R. Abrudan: Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
I. Radu: Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
D. Schmitz: Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
H. Zabel: Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract The exchange bias effect refers to the shift of the hysteresis loop of a ferromagnet in direct contact to an antiferromagnet. For applications in spintronics a robust and tunable exchange bias is required. Here we show experimental evidence for a perpendicular exchange bias in a prototypical ferrimagnetic spin valve consisting of DyCo5/Ta/Fe76Gd24, where the DyCo5 alloy has the role of a hard ferrimagnet and Fe76Gd24 is a soft ferrimagnet. Taking advantage of the tunability of the exchange coupling between the ferrimagnetic layers by means of thickness variation of an interlayer spacer, we demonstrate that perpendicular unidirectional anisotropy can be induced with desirable absolute values at room temperature, without making use of a field-cooling procedure. Moreover, the shift of the hysteresis loop can be reversed with relatively low magnetic fields of several hundred Oersteds. This flexibility in controlling a robust perpendicular exchange bias at room temperature may be of crucial importance for applications.

Date: 2012
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DOI: 10.1038/ncomms1728

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