NDLI: Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38/MgO interfaces: X-ray magnetic circular dichroism study

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Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38/MgO interfaces: X-ray magnetic circular dichroism study

Content Provider	Semantic Scholar
Author	Singh, Vijay Raj Verma, Vipin Ishigami, Keisuke Shibata, Goro Kadono, Toshiharu Fujimori, Atsushi Fred Asakura, Daisuke Koide, Tsuneharu Miura, Yoshio Shirai, Masafumi Li, Gui-Fang Taira, Tomoyuki Yamamoto, Masafumi
Copyright Year	2012
Abstract	We have studied the electronic and magnetic states of Mn and Co atoms at the Co2Mnβ Ge0.38 (CMG)/MgO (β = 0.67–1.8) interfaces, which constitute CMG/MgO/CMG magnetic tunnel junctions, by means of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroisms (XMCDs) at the Mn and Co L2,3 edges and compared the deduced Co and Mn magnetic moments by the density-functional calculations with the coherent potential approximation (CPA). As the Mn content β increased, the intensity of Mn L2,3 XMCD decreased, in agreement with the result of the CPA calculation, which showed the resultant reduction of charges and spin moment on Mn atoms because of the delocalization of Mn 3d electrons with increasing β. The Co spin magnetic moment for all the samples increased with decreasing β, again consistent with the present calculation and the previous density-functional calculation by Picozzi et al. that the CoMn antisite has a larger magnetic moment than that of Co atoms at the regular sites and reduces the spin polarization at the Fermi level and hence the tunnel magnetoresistance ratio.
File Format	PDF HTM / HTML
DOI	10.1103/PhysRevB.86.144412
Volume Number	86
Alternate Webpage(s)	https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/50669/1/e144412.pdf
Alternate Webpage(s)	https://doi.org/10.1103/PhysRevB.86.144412
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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