Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Magnetic Textures: Statics and Imaging I

MA 7.1: Hauptvortrag

Montag, 1. April 2019, 15:00–15:30, H37

The Surface Spin Flop in Synthetic Antiferromagnets with Perpendicular Magnetic Anisotropy — •Benny Böhm1, Nikolai Kiselev2, Darius Pohl3, Lorenzo Fallarino4, Leopold Koch1, Bernd Rellinghaus3, Kornelius Nielsch5, and Olav Hellwig1,41Chemnitz University of Technology — 2Forschungszentrum Jülich and JARA — 3TU Dresden — 4Helmholtz-Zentrum Dresden-Rossendorf — 5IFW Dresden

The talk will provide an introduction to the basic mechanism of the surface spin flop, a transition predicted theoretically for layered antiferromagnets 50 years ago by Mills et. al.[1]. We will present the experimental confirmation that this transition exists also in the case of out-of-plane magnetic anisotropy in addition to the in-plane case studied already earlier [2]. While the in-plane case requires single crystal substrates to create a uniaxial in-plane anisotropy, our out-of-plane easy axis system based on a magnetic multilayer system provides such a uniaxial anisotropy naturally and can thus be easily prepared on amorphous surfaces. Furthermore, we reveal a pathway to stabilize the surface spin flop state, usually only obtained for high external fields of about 0.5 T, also at remanence. Overall, our results make the out-of-plane surface spin flop state accessible for further studies without the requirement of single crystal substrates or external fields, thus opening up the possibility of dynamic studies as well as an easy integration into more complex structures.

[1] D. L. Mills, Phys. Rev. Lett. 20, 1968, p. 18-21

[2] R. W. Wang et al., Phys. Rev. Lett. 72, 1994, p. 920-923

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