J
J. M. D. Coey
Researcher at Trinity College, Dublin
Publications - 767
Citations - 39531
J. M. D. Coey is an academic researcher from Trinity College, Dublin. The author has contributed to research in topics: Magnetization & Ferromagnetism. The author has an hindex of 81, co-authored 748 publications receiving 36364 citations. Previous affiliations of J. M. D. Coey include Beihang University & Centre national de la recherche scientifique.
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Donor impurity band exchange in dilute ferromagnetic oxides.
TL;DR: It is proposed thatferromagnetic exchange here, and in dilute ferromagnetic nitrides, is mediated by shallow donor electrons that form bound magnetic polarons, which overlap to create a spin-split impurity band.
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Mixed-valence manganites
TL;DR: A review of the literature on mixed-valence manganites, placing new results in the context of established knowledge of these materials, and other magnetic semiconductors, is given in this paper.
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Measuring the Spin Polarization of a Metal with a Superconducting Point Contact
R. J. Soulen,J. Byers,M. S. Osofsky,Boris Nadgorny,T. Ambrose,S. F. Cheng,P. R. Broussard,C. T. Tanaka,Janusz J. Nowak,Jagadeesh S. Moodera,A. Barry,J. M. D. Coey +11 more
TL;DR: A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermani surface.
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Giant energy product in nanostructured two-phase magnets.
Ralph Skomski,J. M. D. Coey +1 more
TL;DR: Exchange hardening of nanostructured two-phase systems composed of an aligned hard phase and a soft phase with high magnetization is investigated using an approach which yields analytic nucleation fields from the micromagnetic vector equation, and accounts for interactions between the soft regions.
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Improved magnetic properties by treatment of iron-based rare earth intermetallic compounds in anmonia
J. M. D. Coey,Hong Sun +1 more
TL;DR: In this paper, the R2Ni17 and R2Fe17C intermetallic compounds were found to absorb approximately two atoms of nitrogen per formula unit on heating in ammonia or nitrogen.