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Resonant TMR inversion in LiF/EuS based spin filter tunnel junctions | | Fen Liu
; Yihang Yang
; Qian Xue
; Zhiwei Gao
; Aixi Chen
; Guo-Xing Miao
; | | Date: |
27 Apr 2016 | | Abstract: | Resonant tunneling can lead to inverse tunnel magnetoresistance when impurity
levels rather than direct tunneling dominate the transport process. We
fabricated hybrid magnetic tunnel junctions of CoFe/LiF/EuS/Ti, with an
epitaxial LiF energy barrier joined with a polycrystalline EuS spin-filter
bar-rier. Due to the water solubility of LiF, the devices were fully packaged
in situ. The devices showed sizeable positive TMR up to 16% at low bias
voltages but clearly inverted TMR at higher bias voltages. The TMR inversion
depends sensitively on the thickness of LiF, and the tendency of inversion
disap-pears when LiF gets thick enough and recovers its intrinsic properties. | | Source: | arXiv, 1604.8185 | | Services: | Forum | Review | PDF | Favorites | |
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