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論文

First-principles study of electronic and magnetic structures of CoFeB|Ta and CoFe|TaB heterostructures

濱田 智之*; 大野 隆央*; 前川 禎通

Molecular Physics, 113(3-4), p.314 - 318, 2014/07

 被引用回数:3 パーセンタイル:13.68(Chemistry, Physical)

The electronic and magnetic structures of the CoFeB|Ta and CoFe|TaB heterostructures were investigated from first principles in an attempt to clarify the effect of the Ta layer on the energetic stability and magnetisation of the heterostructures, which are used in magnetic random access memory devices.

論文

Implementation of the DFT+U method and constrained DFT calculations for $$U$$ and $$J$$ within a Pseudopotential formalism; Application to FeO and LaVO$$_{3}$$

濱田 智之*; 大野 隆央*; 前川 禎通

Journal of the Korean Physical Society, 62(12), p.2155 - 2159, 2013/06

 被引用回数:2 パーセンタイル:12.72(Physics, Multidisciplinary)

A first-principles density theory (DFT)+U method based on the pseudopotential (PP) method was developled to enable $$a$$ - $$priori$$ prediction of electronic structures of strongly-correlated electronic structures (SCES) systems. The method determines the radius of the localized electron orbitals of a SCES system and the Hubbard parameteres ${it U}$ and ${it J}$ for the electrons and calculates the electronic structure of the system by using the rotationally-invariant DFT + U method and using the determined radius and parameters. The electronic structure of FeO in the anti-ferromagnetic state was calculated by using the method, and the method could describe the electronic structure of FeO correctly, producing an insulating ground state for FeO with an indirect band gap of 1.88 eV.

論文

Spin transfer torque in MTJs with synthetic ferrimagnetic layers by the Keldysh approach

市村 雅彦*; 濱田 智之*; 今村 裕志*; 高橋 三郎*; 前川 禎通

Journal of Applied Physics, 109(7), p.07C906_1 - 07C906_3, 2011/03

 被引用回数:4 パーセンタイル:20.9(Physics, Applied)

Based on the Keldysh Green's function method within the tight-binding model, the spin transfer torque is analyzed in a magnetic tunnel junction with a synthetic ferrimagnetic (SyF) free layer in the ballistic regime. The spin transfer torque exerted on the magnetizations of ferromagnetic bilayers in the SyF free layer tends to rotate the magnetizations in the same direction as a combined motion of the SyF free layer regardless of the bias direction. This rotation causes a reduction of the critical current for the magnetization switching of the SyF free layer which is consistent with experimental observations.

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