Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 562, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2022.169796
Keywords
Full-Heusler alloy; Half-metallic ferromagnet; Perpendicular magnetic anisotropy; Bulk magnetic anisotropy; Scanning transmission electron microscope
Funding
- NIMS microstructural characterization platform as a program of Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [A-19-NM-0111, A-20-NM-0111]
- JSPS KAKENHI [JP 25889021]
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The bulk magnetic anisotropy of the CFS layers contributes to PMA, and tensile strain for out-of-plane is induced when the thickness is above 1.8 nm; Pd may exist at the CFS/MgO interface, causing bulk anisotropy of the samples with CFS thickness less than 2 nm.
The authors investigated origins of perpendicular magnetic anisotropy (PMA) in a multilayer of full-Heusler Co2FeSi (CFS) alloys, MgO, and Pd. The CFS thickness dependence of the magnetic properties indicated that the bulk magnetic anisotropy of the CFS layers also contributed to the PMA even in the samples where the CFS thickness t(CFS) was 10 nm. The anisotropy constant was drastically increased at t(CFS) = 1.8 nm, and 0.7 nm. The crystal structure analysis indicated that CFS layers had the tensile strain for out-of-plane when the thickness was thicker than 1.8 nm, which can induce the bulk magnetic anisotropy via the magnetostrictive effect. The elemental mapping by a scanning transmission electron microscope revealed that approximately 2 nm thick Pd existed at the CFS/MgO interface. The authors considered the whole CFS layers could contain Pd when the thickness of CFS was less than 2 nm. This Pd might cause the bulk anisotropy of the samples with the CFS thickness below 2 nm since some Pd alloys and Pd/Co and Pd/Fe multilayers have large bulk magnetic anisotropy.
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