Searched for: author:"Barker, Joseph"
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Xie, Li Shan (author), Jin, Guang Xi (author), He, Lixin (author), Bauer, G.E. (author), Barker, Joseph (author), Xia, Ke (author)
Yttrium iron garnet is the ubiquitous magnetic insulator used for studying pure spin currents. The exchange constants reported in the literature vary considerably between different experiments and fitting procedures. Here we calculate them from first principles. The local Coulomb correction (U-J) of density-functional theory is chosen such...
journal article 2017
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Barker, Joseph (author), Bauer, G.E. (author)
The magnetic insulator yttrium iron garnet can be grown with near perfection and is therefore and ideal conduit for spin currents. It is a complex material with 20 magnetic moments in the unit cell. In spite of being a ferrimagnet, YIG is almost always modeled as a simple ferromagnet with a single spin wave mode. We use the method of...
journal article 2016
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Ganzhorn, Kathrin (author), Barker, Joseph (author), Schlitz, Richard (author), Piot, Benjamin A. (author), Ollefs, Katharina (author), Guillou, F. (author), Wilhelm, Fabrice (author), Rogalev, Andrei (author), Bauer, G.E. (author)
We study the spin Hall magnetoresistance effect in ferrimagnet/normal metal bilayers, comparing the response in collinear and canted magnetic phases. In the collinear magnetic phase, in which the sublattice magnetic moments are all aligned along the same axis, we observe the conventional spin Hall magnetoresistance. In contrast, in the canted...
journal article 2016