*Note: This news was first mentioned in the June 2011 issue of Nanotech Japan Update*
Institute for Solid State Physics, the University of Tokyo and RIKEN (Institute of Physical and Chemical Research) announced, on May 23, 2011, that researchers from both institutes succeeded in the magnetic control of anomalous Hall effect (AHE) induced by spin chirality. Details were published in Physical Review Letters.
Since spin chirality (solid angle formed by spin) is accompanied with a strong virtual magnetic field, AHE is observed without applying field. Such large Hall voltages under weak magnetic fields may lead to a promising nonvolatile memory with reduced power dissipation because of the absence of hysteresis loss.
In the present work, AHE of the chiral spin states of Pr2Ir2O7 was found to appear below 1.5 K at a zero magnetic field with hysteresis most pronounced for fields cycled along the  direction. A large positive magnetoresisitance was also observed only for fields along the  direction. These observa-tions suggest the reconstruction of the electronic structure of the conduction electrons by the field-induced spin texture.
The present results, the authors of the paper expect, may provide a mean to control magnetically the AHE induced by spin chirality, which might be a step toward nonvolatile memory based on the AHE.
L. Balicas, S. Nakatsuji, Y. Machida, and S. Onoda, "Anisotropic Hysteretic Hall Effect and Magnetic Control of Chiral Domains in the Chiral Spin States of Pr2Ir2O7", Physical Review Letters, Vol. 106, No. 21, p. 217204 (2011) [4 pages] Published May 26, 2010
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