Abstract
The ferrimagnetic superlattice (SL) [MnGa/Co2FeAl]n exhibiting perpendicular magnetic anisotropy opened a new method for spintronics materials used in magnetic random access memory, because of the high anisotropy, small damping constant and tunable magnetization. In this work, we fabricated SLs with different MnGa composition and studied the MnGa composition dependence of the structure and magnetic properties of the SLs. Furthermore, we fabricated fully perpendicular magnetic tunnel junctions with SLs as both top and bottom electrodes. A clear tunnel magnetoresistance (TMR) effect with TMR ratio of 1.3% at room temperature was observed.
Highlights
The ferrimagnetic superlattice (SL) [MnGa/Co2FeAl]n exhibiting perpendicular magnetic anisotropy opened a new method for spintronics materials used in magnetic random access memory, because of the high anisotropy, small damping constant and tunable magnetization
Several types of ferromagnets with perpendicular magnetic anisotropy (PMA) were developed since including tradition/noblemetal alloys/multilayers (e.g, FePt alloys, Co/Pt multilayers), rare-earth/transition-metal alloys (e.g. TbFeCo alloys), ultra-thin 3d ferromagnetic films including CoFeB and CoFeAl, and recent promising tetragonal Heusler alloys, such as MnGa and MnGe alloys.[9,10,11,12,13,14]. This is because the high anisotropy (Ku) is necessary to overcome the thermal fluctuation as the cell lateral size minimization
Ferrimagnetic/antiferromagnetic materials were proposed for recording media and spintronics devices, owing to the fact that the distance between ferrimagnetic, especially antiferromagnetic islands can be drastically reduced without fearing of the information stored on one island affecting that of neighboring islands compared to ferromagnets
Summary
The ferrimagnetic superlattice (SL) [MnGa/Co2FeAl]n exhibiting perpendicular magnetic anisotropy opened a new method for spintronics materials used in magnetic random access memory, because of the high anisotropy, small damping constant and tunable magnetization. The SL supplies a new avenue for magnetic recording media and spintronics devices due to the high Ku and tunable coercive force (Hc).[20] In this letter, we fabricated SLs with different MnGa compositions and studied the MnGa composition dependence of the structure and magnetic properties of the SLs. we demonstrated the tunnel magnetoresistance (TMR) effect at room temperature in fully perpendicular magnetic tunnel junctions (pMTJs) based on SLs, where the SLs with different Hc are used as bottom and top electrodes.
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