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arXiv · 2005.00427

All-electrical detection of skyrmion lattice state and chiral surface twists

A. Aqeel·M. Azhar·N. Vlietstra·A. Pozzi·J. Sahliger·H. Huebl·T. T. M. Palstra·C. H. Back·M. Mostovoy
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Abstract

We study the high-temperature phase diagram of the chiral magnetic insulator Cu$_2$OSeO$_3$ by measuring the spin-Hall magnetoresistance (SMR) in a thin Pt electrode. We find distinct changes in the phase and amplitude of the SMR signal at critical lines separating different magnetic phases of bulk Cu$_2$OSeO$_3$. The skyrmion lattice state appears as a strong dip in the SMR phase. A strong enhancement of the SMR amplitude is observed in the conical spiral state, which we explain by an additional symmetry-allowed contribution to the SMR present in non-collinear magnets. We demonstrate that the SMR can be used as an all-electrical probe of chiral surface twists and skyrmions in magnetic insulators.

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A. Aqeel, M. Azhar, N. Vlietstra, A. Pozzi, J. Sahliger, H. Huebl, T. T. M. Palstra, C. H. Back, M. Mostovoy. 2020-05-01. All-electrical detection of skyrmion lattice state and chiral surface twists. https://doi.org/10.1103/physrevb.103.l100410

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