New theory shows how magnetic textures in altermagnets could steer electron spins
Researchers at Louisiana State University and the University of Stuttgart have proposed a mechanism for routing spin information through altermagnets, a recently identified class of materials whose alternating magnetic moments cancel out any net magnetization while still letting electrons of opposite spin behave differently as they move through the crystal.
Illustration of a circular domain wall in an altermagnet. The orange and blue arrows show alternating magnetic moments gradually changing direction across the shaded ring, creating a texture that can steer electrons differently depending on their spin. Image credit: LSU
The study addresses a practical problem for spintronics, which encodes information in electron spin rather than charge: altermagnets can already treat spin-up and spin-down electrons differently without producing a stray magnetic field, but researchers have lacked a way to control where each spin state actually goes. The team’s calculations show that gradual rotations in an altermagnet’s internal magnetic order, such as those found at a domain wall separating two differently oriented regions, reshape the effective paths available to electrons depending on their spin – with the magnetic texture acting like a landscape of hills and valleys that bends spin-up and spin-down electrons differently, similar to how a lens bends light.
Source: https://www.spintronics-info.com/new-theory-shows-how-magnetic-textures-altermagnets-could-steer-electron-spins
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