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

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

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

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arxiv 2005.00427 v1 pith:LV2VDAHM submitted 2020-05-01 cond-mat.mes-hall cond-mat.mtrl-sci

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

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M. Mostovoy

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classification cond-mat.mes-hallcond-mat.mtrl-sci

keywords chiralmagneticphasestateall-electricalamplitudelatticeoseo

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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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