Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.65: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Unidirectional spin Hall magnetoresistance and thermal effects in Pt/Co, Ta/Co and multilayer systems — •Anastasiia Moskaltsova, Daniel Meier, Timo Kuschel, Jan-Michael Schmalhorst, and Günter Reiss — CSMD, Department of Physics, Bielefeld University, Germany
Recently, the unidirectional spin Hall magnetoresistance (USMR) has been found in ferromagnetic (FM)/heavy metal (HM) bilayer systems [1]. Magnetoresistive (MR) effects, like anisotropic magnetoresistance and spin Hall magnetoresistance are usually symmetric with the current polarity and proportional to m2, while by using USMR one can detect a change in resistance by reversing current or magnetization direction. This is related to the spin accumulation at the FM/HM interface induced by spin Hall effect. This effect can be potentially used in applications for sensing and multi-state memory devices [2]. In this work we present harmonic measurements of angular dependences in Pt/Co, Ta/Co and multilayer systems. By varying the FM/HM layer order and stack repetitions we can extract the information about the interface influence on USMR as well as other MR effects. It was found that variation of the FM/HM layer order can give rise to a more complex second harmonic signal, which can be explained by additional thermoelectric contributions. Thus, the layer thickness and ordering play significant role and can change the contribution of the thermal effects, while keeping the magnitude of the USMR constant.
[1] C. O. Avci et al., Nat. Phys. 11, 570 (2015)
[2] C. O. Avci et al., Appl. Phys. Lett. 110, 203506 (2017)