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Ultrafast optically induced ferromagnetic state in an elemental antiferromagnet

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arxiv 2006.16061 v4 pith:7CJS4SP4 submitted 2020-06-29 cond-mat.mes-hall cond-mat.mtrl-sci

E. Golias , I. Kumberg , I. Gelen , S. Thakur , J. Gördes , R. Hosseinifar , Q. Guillet , J. K. Dewhurst
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S. Sharma C. Schü{ss}ler-Langeheine N. Pontius W. Kuch
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classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords ferromagneticinducedopticallystatetransientultrafastalignmentantiferromagnet
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abstract

We present evidence for an ultrafast optically induced ferromagnetic alignment of antiferromagnetic Mn in Co/Mn multilayers. We observe the transient ferromagnetic signal at the arrival of the pump pulse at the Mn L$_3$ resonance using x-ray magnetic circular dichroism in reflectivity. The timescale of the effect is comparable to the duration of the excitation and occurs before the magnetization in Co is quenched. Theoretical calculations point to the imbalanced population of Mn unoccupied states caused by the Co interface for the emergence of this transient ferromagnetic state.

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