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Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi
no journal, ,
Matsuo, Mamoru; Ieda, Junichi; Maekawa, Sadamichi
no journal, ,
We show the enhancement of the spin-rotation coupling due to the interband mixing. The Bloch wave functions in the presence of mechanical rotation are constructed with the generalized crystal momentum which includes a gauge potential originating from the rotation. Using the Kane model, the renormalized spin-rotation coupling is explicitly derived. As a result of the renormalization, the rotational Doppler shift in electron spin resonance, the mechanical torque on an electron spin, and the spin current generation due to elastic deformation will be strongly enhanced.
Ieda, Junichi; Barnes, S. E.*; Maekawa, Sadamichi
no journal, ,
The control of the magnetic anisotropy (MA) of ultra-thin ferromagnetic layers using an electric field would lead to many technologically important applications. To date, while it is usually assumed the changes in the MA arises from surface charge doping of the magnetic layer, a number of key experiments cannot be understood within such a scenario. Much studied is the fact that, for non-magnetic conductors, a large surface electric field gives rise to a Rashba spin-orbit (RSO) coupling which leads to a spin-splitting of the conduction electrons. We develop a theory for the MA based on the RSO interaction and the Stoner model. The competition between the RSO fields and the exchange interaction leads to a large MA arising from the internal electric fields which exist at, e.g., ferromagnetic/metal and ferromagnetic/insulator interfaces. This different path to an electrically induced MA energy can explain the electric field, thickness, and material dependence reported in many experiments.
Honda, Mitsunori; Yanagida, Masatoshi*; Han, L.*; Miyano, Kenjiro*
no journal, ,
Sakai, Toru; Nakano, Hiroki*
no journal, ,
By means of the numerical diagonalization method, we study the S=1/2 Heisenberg antiferromagnet on the square-kagome lattice, similar to the kagome lattice. We examine the ground-state properties and the magnetization process of the model. It is found that a magnetization jump appears at the higher-field-side edge of the manetization plateau at the one-third height of the saturation. A spin-flop phenomenon is clearly observed at the jump even when the system is isotropic in the spin space.