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Journal Articles

Spin colossal magnetoresistance in an antiferromagnetic insulator

Qiu, Z.*; Hou, D.*; Barker, J.*; Yamamoto, Kei; Gomonay, O.*; Saito, Eiji*

Nature Materials, 17(7), p.577 - 580, 2018/05

 Times Cited Count:71 Percentile:96.98(Chemistry, Physical)

Colossal magnetoresistance (CMR) refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metal-insulator transition. CMR occurs due to a correlation between the magnetic structure and electron conduction and has inspired extensive studies for decades. Here, in the antiferromagnetic insulator Cr$$_{2}$$O$$_{3}$$, we found a sharp transition between conducting and nonconducting states for spin currents at room temperature. The spin-current transmission changes by two orders of magnitude within a narrow temperature window of 14K around the Neel temperature. The spin conductor-nonconductor transition can be modulated by a magnetic field, giving an isothermal change of spin-current transmission of up to 500%, effectively an on-off switch for spin currents.

Journal Articles

Tunable sign change of spin hall magnetoresistance in Pt/NiO/YIG structures

Hou, D.*; Qiu, Z.*; Barker, J.*; Sato, Koji*; Yamamoto, Kei; V$'e$lez, S.*; Gomez-Perez, J. M.*; Hueso, L. E.*; Casanova, F.*; Saito, Eiji

Physical Review Letters, 118(14), p.147202_1 - 147202_6, 2017/04

 Times Cited Count:85 Percentile:98(Physics, Multidisciplinary)

Journal Articles

Origin of the spin Seebeck effect in compensated ferrimagnets

Gepr$"a$gs, S.*; Kehlberger, A.*; Coletta, F.*; Qiu, Z.*; Guo, E.-J.*; Schulz, T.*; Mix, C.*; Meyer, S.*; Kamra, A.*; Althammer, M.*; et al.

Nature Communications (Internet), 7, p.10452_1 - 10452_6, 2016/02

 Times Cited Count:100 Percentile:97.17(Multidisciplinary Sciences)

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