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Materials 2015, 8(9), 6531-6542; doi:10.3390/ma8095320

Engineered Heusler Ferrimagnets with a Large Perpendicular Magnetic Anisotropy

WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Author to whom correspondence should be addressed.
Academic Editor: Jan Ingo Flege
Received: 6 August 2015 / Revised: 4 September 2015 / Accepted: 15 September 2015 / Published: 22 September 2015
(This article belongs to the Special Issue Epitaxial Materials 2015)
View Full-Text   |   Download PDF [1094 KB, uploaded 22 September 2015]   |  


Synthetic perpendicular magnetic anisotropy (PMA) ferrimagnets consisting of 30-nm-thick D022-MnGa and Co2MnSi (CMS) cubic Heusler alloys with different thicknesses of 1, 3, 5, 10 and 20 nm, buffered and capped with a Cr film, are successfully grown epitaxially on MgO substrate. Two series samples with and without post annealing at 400 °C are fabricated. The (002) peak of the cubic L21 structure of CMS films on the MnGa layer is observed, even for the 3-nm-thick CMS film for both un-annealed and annealed samples. The smaller remnant magnetization and larger switching field values of CMS (1–20 nm)/MnGa (30 nm) bilayers compared with 30-nm-thick MnGa indicates antiferromagnetic (AFM) interfacial exchange coupling (Jex) between MnGa and CMS films for both un-annealed and annealed samples. The critical thickness of the CMS film for observing PMA with AFM coupling in the CMS/MnGa bilayer is less than 10 nm, which is relatively large compared to previous studies. View Full-Text
Keywords: epitaxial film; MnGa; Co2MnSi cubic Heusler alloy; synthetic PMA ferrimagnets epitaxial film; MnGa; Co2MnSi cubic Heusler alloy; synthetic PMA ferrimagnets

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ranjbar, R.; Suzuki, K.; Sugihara, A.; Miyazaki, T.; Ando, Y.; Mizukami, S. Engineered Heusler Ferrimagnets with a Large Perpendicular Magnetic Anisotropy. Materials 2015, 8, 6531-6542.

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