Magnon trap by chiral spin pumping (Editors' Suggestion)

Image credit: [Tao Yu]


Chiral spin pumping is the generation of a unidirectional spin current in half of ferromagnetic films or conductors by dynamic dipolar stray fields from close-by nanomagnets. We formulate a general theory of long-range chiral interactions between magnets mediated by unidirectional traveling waves, e.g., spin waves in a magnetic film or microwaves in a waveguide. The traveling waves emitted by an excited magnet can be perfectly trapped by a second, initially passive magnet by a dynamical interference effect. When both magnets are excited by a uniform microwave, the chiral interaction between them creates a large imbalance in their magnon numbers.

Phys. Rev. B 102, 054429 (2020)

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Tao Yu
Tao Yu
Professor, Group Leader

My research interests include Magnetism, Spintronics, Unconventional superconductivity, Quantum transport in low dimensional electronics, and Strong light-matter interaction.