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MA: Fachverband Magnetismus
MA 44: Spininjection / Spin currents in heterostructures
MA 44.5: Talk
Thursday, March 10, 2016, 16:00–16:15, H31
Spin-Hall magnetoresistance and spin Seebeck effect in non-collinear magnetic insulators — •Aisha Aqeel1, Nynke Vlietstra1, Jeroen A. Heuver1, Gerrit E. W. Bauer2,3, Beatriz Noheda1, Bart J. van Wees1, and Thomas T. M. Palstra1 — 1Zernike Institute for Advanced Materials, University of Groningen, The Netherlands — 2Institute for Materials Research and WPI-AIMR, Tohoku University, Sendai, Miyagi 980-8577, Japan — 3Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Recently, the spin-Hall Magnetoresistance (SMR) and the spin Seebeck effect (SSE) have attracted much interest in the field of spintronics. However, these effects have been studied only for collinear magnetic systems. The nature and sensitivity of these effects in non-collinear magnetic insulators is still unknown. Here, we present a study of the SMR and the SSE in a non-collinear magnetic insulator CoCr2O4 (CCO) with Pt contacts. CoCr2O4 (CCO) is a spinel with a collinear ferrimagnetic state below Tc = 94 K and non-collinear magnetic phases at lower temperatures. Through lock-in detection technique, we show the existence of the SMR and the SSE in different magnetic phases. We observe a large enhancement in SMR and SSE in the non-collinear phase of the CCO, which indicates that the interaction between spins at the Pt|CCO interface is more efficient in the non-collinear magnetic state. Our results show that the spin transport at the Pt|CCO interface is sensitive to different magnetic phases but cannot be explained solely by the bulk magnetization.