Colossal magnetoresistance (CMR) refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metal–insulator transition and has inspired extensive studies for decades1,2. Here we demonstrate an analogous spin effect near the Néel temperature, TN = 296 K, of the antiferromagnetic insulator Cr2O3. Using a yttrium iron garnet YIG/Cr2O3/Pt trilayer, we injected a spin current from the YIG into the Cr2O3 layer and collected, via the inverse spin Hall effect, the spin signal transmitted into the heavy metal Pt. We observed a two orders of magnitude difference in the transmitted spin current within 14 K of the Néel temperature. This transition between spin conducting and non-conducting states was also modulated by a magnetic field in isothermal conditions. This effect, which we term spin colossal magnetoresistance (SCMR), has the potential to simplify the design of fundamental spintronics components, for instance, by enabling the realization of spin-current switches or spin-current-based memories.
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This work was supported by JST-ERATO ‘Spin Quantum Rectification’, JST-PRESTO ‘Phase Interfaces for Highly Efficient Energy Utilization’, Grant-in-Aid for Scientific Research on Innovative Area, ‘Nano Spin Conversion Science’ (26103005 and 26103006), Grant-in-Aid for Scientific Research (S) (25220910), Grant-in-Aid for Scientific Research (A) (25247056 and 15H02012), Grant-in-Aid for Challenging Exploratory Research (26600067), Grant-in-Aid for Research Activity Start-up (25889003) and World Premier International Research Center Initiative (WPI), all from MEXT, Japan. Z.Q. acknowledges support from the ‘Fundamental Research Funds for the Central Universities (DUT17RC(3)073)’. D.H. acknowledges support from Grant-in-Aid for young scientists (B) (JP17K14331), J.B. acknowledges supports from the Graduate Program in Spintronics, Tohoku University, and Grand-in-Aid for Young Scientists (B) (17K14102). K.Y. and O.G. acknowledge support from the Humboldt Foundation and EU ERC Advanced Grant no. 268066. K.Y. acknowledges the Transregional Collaborative Research Center (SFB/TRR) 173 SPIN+X and DAAD project ‘MaHoJeRo’. O.G. acknowledges the EU FET Open RIA Grant no. 766566 and the DFG (project SHARP 397322108).
Supplementary Notes 1–4, Supplementary Figures 1–3, Supplementary References 1–5
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Nature Materials (2018)