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arXiv · 1806.10911

Spin relaxation in multilayers with synthetic ferrimagnets

Dmytro M. Polishchuk·Taras I. Polek·Akashdeep Kamra·Anatolii F. Kravets·Alexandr I. Tovstolytkin·Arne Brataas·Vladislav Korenivski
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Abstract

We demonstrate a strong tunability of the spin-pumping contribution to magnetic damping in a thin-film ferromagnetic free layer interfaced with a synthetic ferrimagnet (SFM), acting as a spin-sink, via a thin Cu-spacer. The effect strongly depends on the magnetic state of the SFM, a trilayer structure composed of two Fe layers coupled via indirect exchange mediated by a Cr spacer. With increasing Cr thickness, the SFM state undergoes a transition from an antiparallel via a non-collinear to a parallel configuration. We can explain the corresponding non-monotonous dependence of spin relaxation in the free layer in terms of a modulation of the longitudinal spin transport as well as relaxation of the transverse angular momentum in the SFM. The results should be useful for designing high-speed spintronic devices where tunability of spin relaxation is advantageous.

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Dmytro M. Polishchuk, Taras I. Polek, Akashdeep Kamra, Anatolii F. Kravets, Alexandr I. Tovstolytkin, Arne Brataas, Vladislav Korenivski. 2018-06-28. Spin relaxation in multilayers with synthetic ferrimagnets. https://doi.org/10.1103/physrevb.98.144401

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