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Ferromagnetic dislocations in antiferromagnetic NiO

Abstract

Crystal lattice defects often degrade device functionality1,2, but engineering these defects may have value in future electronic and magnetic device applications. For example, dislocations—one-dimensional lattice defects with locally distinct atomic-scale structures3,4—exhibit unique and localized electrical properties5,6 and can be used as a template for producing conducting nanowires in insulating crystals7,8,9,10,11. It has also been predicted that spin-polarized current may flow along dislocations in topological insulators12. Although it is expected that the magnetic properties of dislocations will differ from those of the lattice5,13,14, their fundamental characterization at the individual level has received little attention. Here, we demonstrate that dislocations in NiO crystals show unique magnetic properties. Magnetic force microscopy imaging clearly reveals ferromagnetic ordering of individual dislocations in antiferromagnetic NiO, originating from the local non-stoichiometry of the dislocation cores. The ferromagnetic dislocations have high coercivity due to their strong interaction with the surrounding antiferromagnetic bulk phase. Although it has already been reported that nanocrystals of rock-salt NiO show ferromagnetic behaviour15, our study characterizes the ferromagnetic properties of individual lattice defects. We discuss the origin of the unexpected ferromagnetism in terms of the physical properties of the atomic-scale core structures of single dislocations, and demonstrate that it is possible to fabricate stable nanoscale magnetic elements inside crystalline environments composed of these microstructures.

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Figure 1: Ferromagnetic dislocations in the NiO thin film.
Figure 2: Magnetic hysteresis loop of dislocations in the NiO thin film.
Figure 3: Atomic-scale structures of the dislocation cores in the NiO thin film.
Figure 4: Electronic structures of the dislocations in NiO.

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Acknowledgements

This study was supported in part by the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) and the Ministry of Education, Culture, Sports and Technology (MEXT). I.S. and S.K. were supported as JSPS research fellows. N.S. acknowledges support from JST-PRESTO and JSPS KAKENHI Grant number 23686093. This work was conducted in the research Hub for Advanced Nano Characterization, the University of Tokyo, supported by MEXT. Part of this work was performed using the facilities of the Cryogenic Research Center at the University of Tokyo. Calculations were conducted on supercomputers at the ISSP, the University of Tokyo.

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I.S. carried out the experiments and wrote the paper. N.S. designed the experiments and wrote the paper. Z.W. carried out the DFT calculations. T.Y. designed and conducted the experiments. S.K. supported and advised the experiments. Y.I. discussed the results and directed the entire study. All authors read and commented on the manuscript.

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Correspondence to Yuichi Ikuhara.

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The authors declare no competing financial interests.

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Sugiyama, I., Shibata, N., Wang, Z. et al. Ferromagnetic dislocations in antiferromagnetic NiO. Nature Nanotech 8, 266–270 (2013). https://doi.org/10.1038/nnano.2013.45

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