Interface perpendicular magnetic anisotropy in heterostructures consisting of CoFeB and conductive rock-salt Li–Ti–O

Hiroki Koizumi; Zhenchao Wen; Jun Uzuhashi; Tadakatsu Ohkubo; Hiroaki Sukegawa; Seiji Mitani

doi:10.1088/1361-6463/adbb78

論文 Interface perpendicular magnetic anisotropy in heterostructures consisting of CoFeB and conductive rock-salt Li–Ti–O

Hiroki Koizumi ; Zhenchao Wen ; Jun Uzuhashi ; Tadakatsu Ohkubo ; Hiroaki Sukegawa ; Seiji Mitani

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Hiroki Koizumi, Zhenchao Wen, Jun Uzuhashi, Tadakatsu Ohkubo, Hiroaki Sukegawa, Seiji Mitani. Interface perpendicular magnetic anisotropy in heterostructures consisting of CoFeB and conductive rock-salt Li–Ti–O. Journal of Physics D: Applied Physics. 2025, 58 (16), . https://doi.org/10.1088/1361-6463/adbb78

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(abstract)

We investigated interface perpendicular magnetic anisotropy (PMA) in magnetic heterostructures consisting of ferromagnetic metal CoFeB and conductive rock-salt Li–Ti–O (LTO) layers, which can be classified into an unconventional group different from metallic multilayers and tunnel junctions. The rock-salt structure was confirmed by reflection high-energy electron diffraction for the 5 nm thick LTO layers epitaxially grown on a MgO(001) buffer layer. Interface PMA was clearly observed for the LTO/CoFeB heterostructures with post-annealing (PA) above 250 ◦C, and the effective PMA energy density reached 1.18 Merg cm−3 with PA at 300 ◦C. The LTO layer thickness dependence of the resistance area product and tunnel magnetoresistance showed a clear difference in transport properties between the present LTO/CoFeB and the conventional MgO/CoFeB heterostructures, as evidence for the electrical conductivity of LTO in the LTO/CoFeB heterostructure. The conductive LTO can be used as a new building block for a PMA heterostructure for spintronic devices.

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This is the Accepted Manuscript version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://dx.doi.org/10.1088/1361-6463/adbb78.