Perpendicular magnetic anisotropy of Pt/Co₂FeAl_0.5Si_0.5/MgAl₂O₄ trilayers

Abstract

Phone/Fax: þ86 10 62334698 Perpendicular magnetic anisotropy (PMA) has been achieved in Co 2 FeAl 0.5 Si 0.5 (CFAS) based trilayers with MgAl 2 O 4 (MAO) as oxide layer. It was found that the PMA is sensitive to the annealing conditions, the thicknesses of MAO (t MAO ) and CFAS (t CFAS ) layers. A strong PMA can be observed in the Pt/CFAS/MAO structure after 340 8C annealing and maintained as high as 400 8C. For a fixed CFAS thickness (t CFAS ¼ 1.5 nm), there is a narrow range of t MAO to keep the PMA in this structure. Oxidation at the CFAS/MAO interface plays a very significant role to the PMA, which can be controlled by tuning t MAO for fixed annealing temperature and t CFAS .

Magnetic tunnel junctions with perpendicular easy axis at junction diameter of less than 20 nm

“…[76][77][78] The demonstration of a high-performance p-MTJ using the CoFeB=MgO system triggered extensive studies on interfacial anisotropy at other FM and oxide interfaces; subsequently, the presence of interfacial anisotropy was found in many FM-oxide systems such as Co 2 FeAl=MgO, 79) Co 2 FeSi= MgO, 80) Co 2 MnSi=MgO, 81) Fe=MgAl 2 O 4 , 82) CoFeB= MgAl 2 O 4 , 83) FeCr 1−x Co x Si=MgO, 84) and Co 2 FeAl 0.5 Si 0.5 = MgAl 2 O 4 . 85)…”

Perpendicular magnetic anisotropy in Pt/Co-based full Heusler alloy/MgO thin-film structures

“…Large magnetoresistive ratios are experimentally demonstrated in certain Co2YZ based in-plane [11][12][13][14][15][16][17][18] and out-of-plane 19,20 magnetized magnetic tunnel junctions (MTJs) and relatively low Gilbert damping parameters were determined for some compounds [21][22][23][24][25][26][27][28] . Furthermore, PMA was evidenced for Co2FeAl/MgO 19,[29][30][31][32][33] , Co2FeAl0.5Si0.5/MgO [34][35][36][37] , Co2FeSi/MgO 38,39 or Co2FexMn1-xSi/MgO 40,41 structures with different non-magnetic underlayers. In some of the cases, an annealing stage was necessary to induce PMA, while for the other the perpendicular magnetization was achieved even in the as-deposited state.…”

Perpendicular magnetic anisotropy of Pd/Co2MnSi/MgAl2O4/Pd structure films

“…In addition to these, MAO has a small lattice mismatch with Co-based Heusler alloys [20]. Wu et al successed in observing PMA in Co 2 FeAl 0.5 Si 0.5 based trilayers with MAO as oxide layer [21]. In this paper, We selected Co 2 MnSi (CMS) which is verified to be more conducive to achieve high spin polarization than Co 2 FeAl 0.5 Si 0.5 as the ferromagnetic layer and MAO as the oxide layer [22,23].…”