What is it about?

RTFM is believed to originate surface defects. Is this really a surface phenomenon? We have investigated this question using a metal-insulator transition material and finally, RTFM was concluded to a surface phenomenon.

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Why is it important?

Existence of ferromagnetism in both insulation and metallic regions reveals that RTFM is a surface phenomenon. And, the surface to the volume ration was estimated by the amount of magnetization variation at the transition temperature in case of VO2 nanoparticles.


Our results indicate that RTFM is a surface phenomenon related with oxygen defects. Namely, every oxide semiconductors can possess RTFM by introducing surface defects. It is really important for the spintronics device based on the Si device because any transition elements are prohibited to use in Si. Our results are expected to open the window for the next-generation spintronics device based on Si.

Kouichi Takase
College of Science and Technology, Nihon University

Read the Original

This page is a summary of: Room-temperature ferromagnetism in metal–insulator transition nanoparticles of VO2, Applied Physics Letters, January 2023, American Institute of Physics,
DOI: 10.1063/5.0132027.
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