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The exchange-coupled hard/soft magnetic material, proposed in 1991 by Kneller et al.[1], is widely regarded as an excellent next-generation permanent magnetic material. A perfect composite material is expected to hold a large energy product because of the combination of the large remanence of the soft phase and the high coercivity of the hard phase. A giant energy product as high as 120 MG Oe was...
The intriguing magnetic states — skyrmion and skyrmion lattice — have been observed and created in helical magnetics, such as MnSi, Fe1−xCoxSi, the helical FeGe and monolayer Fe film [1-3]. The skyrmions in helical magnets are always associated with the chiral magnetic interaction, namely Dzyaloshinskii-Moriya interaction (DMI). However, several novel works present new approaches to create the skyrmion...
A skyrmion is a topological particle-like excitation in classical continuum field theory [1-3]. Skyr-mion can be driven by spin-polarized current [4, 5]. However, to move the skyrmion along the central line of a nanotrack by in-plane spin-polarized current requires severe matching between the damping coefficient and the non-adiabatic coefficient, i.e. α is close to β, limiting possible material systems...
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