First-principle study of spin transport property in L1_0-FePd(001)/graphene heterojunction
arXiv (Cornell University)(2023)
摘要
In our previous work, we synthesized a metal/2D material heterointerface
consisting of L1_0-ordered iron-palladium (FePd) and graphene (Gr) called
FePd(001)/Gr. This system has been explored by both experimental measurements
and theoretical calculations. In this study, we focus on a heterojunction
composed of FePd and multilayer graphene referred to as
FePd(001)/m-Gr/FePd(001), where m represents the number of graphene layers.
We perform first-principles calculations to predict their spin-dependent
transport properties. The quantitative calculations of spin-resolved
conductance and magnetoresistance (MR) ratio (150-200
proposed structure can function as a magnetic tunnel junction in spintronics
applications. We also find that an increase in m not only reduces conductance
but also changes transport properties from the tunneling behavior to the
graphite π-band-like behavior. Additionally, we investigate the
spin-transfer torque-induced magnetization switching behavior of our
junction structures using micromagnetic simulations.
Furthermore, we examine the impact of lateral displacements (“sliding”) at
the interface and find that the spin transport properties remain robust despite
these changes; this is the advantage of two-dimensional material
hetero-interfaces over traditional insulating barrier layers such as MgO.
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关键词
spin transport property,$l1_0$-fepd001/graphene,first-principle
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