Anomalous Spontaneous Reversal in Magnetic Heterostructures

Details Anomalous Spontaneous Reversal in Magnetic Heterostructures Anomalous Spontaneous Reversal in Magnetic Heterostructures

2006-03-08

arxiv.org/abs/cond-mat/0603224v1

Physics

Condensed Matter

Materials Science

14 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.137201

We observe a thermally induced spontaneous magnetization reversal of epitaxial ferromagnet/antiferromagnet heterostructures under a constant applied magnetic field. Unlike any other magnetic system, the magnetization spontaneously reverses, aligning anti-parallel to an applied field with decreasing temperature. We show that this unusual phenomenon is caused by the interfacial antiferromagnetic coupling overcoming the Zeeman energy of the ferromagnet. A significant temperature hysteresis exists, whose height and width can be tuned by the field applied during thermal cycling. The hysteresis originates from the intrinsic magnetic anisotropy in the system. The observation of this phenomenon leads to open questions in the general understanding of magnetic heterostructures. Moreover, this shows that in general heterogeneous nanostructured materials may exhibit unexpected phenomena absent in the bulk.

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