62 citations · 220 across the 12 of their papers we have counts for
12 papers
Ab initio study of magnetoresistance effect in antiferromagnetic tunnel junction
Katsuhiro Tanaka, Yuta Toga, Susumu Minami +4
The antiferromagnets with the time-reversal symmetry broken magnetic structures possess a finite spin splitting in the momentum space, and may contribute to a realization of a fini…
Anisotropy of exchange stiffness based on atomic-scale magnetic properties in rare-earth permanent magnet NdFeB
Yuta Toga, Masamichi Nishino, Seiji Miyashita +2
We examine the anisotropic properties of the exchange stiffness constant, , for rare-earth permanent magnet, NdFeB, by connecting analyses with two differen…
Study on Effects of Dipole-dipole Interactions in Nd_2Fe_{14}B thin film Based on Stochastic Cut-off Method with New Efficient Algorithm
Taichi Hinokihara, Masamichi Nishino, Yuta Toga +1
We developed a new algorithm for the stochastic cutoff method, which is a Monte Carlo method for long-range interacting systems. The present new algorithm is efficient for complica…
First-principles study on the magnetic properties of ordered Nd(Fe,Ga) alloys
Kazushige Hyodo, Yuta Toga, Akimasa Sakuma
We studied the stable magnetic structure of ordered NdFeGa ( alloys, which appears in the grain-boundary (GB) phase of Nd-Fe-B permanent magnets, usin…
Monte Carlo analysis for finite temperature magnetism of NdFeB permanent magnet
Yuta Toga, Munehisa Matsumoto, Seiji Miyashita +4
We investigate the effects of magnetic inhomogeneities and thermal fluctuations on the magnetic properties of a rare earth intermetallic compound, NdFeB. The constrained…
First-principles study on interface magnetic structure in NdFeB/(Fe,Co) exchange spring magnets
Nobuyuki Umetsu, Yuta Toga, Akimassa Sakuma
The magnetic properties of NdFeB (NFB)/transition metal (TM = Fe, Co) multilayer systems are studied on the basis of first-principles density functional calculations…
Loop Current and Antiferromagnetic States in Fermionic Hubbard Model with Staggered Flux at Half Filling
Yuta Toga, Hisatoshi Yokoyama
Anticipating realization of interacting fermions in an optical lattice with a large gauge field, we consider phase transitions and loop currents in a two-dimensional S=1/2 fermioni…
Dynamical instability in the S=1 Bose-Hubbard model
Rui Asaoka, Hiroki Tsuchiura, Makoto Yamashita +1
We study the dynamical instabilities of superfluid flows in the S=1 Bose-Hubbard model. The time evolution of each spin component in a condensate is calculated based on the dynamic…
Parallelized Stochastic Cutoff Method for Long-Range Interacting Systems
Eishin Endo, Yuta Toga, Munetaka Sasaki
We present a method to parallelize the stochastic cutoff (SCO) method, which is a Monte-Carlo method for long-range interacting systems. After interactions are eliminated by the SC…
Effects of trace elements on the crystal field parameters of Nd ions at the surface of NdFeB grains
Yuta Toga, Tsuneaki Suzuki, Akimasa Sakuma
Using first-principles calculations, we investigate the positional dependence of trace elements such as O and Cu on the crystal field parameter , proportional to the anisotr…
Density Modulations Associated with the Dynamical Instability in the Bose-Hubbard Model
Rui Asaoka, Hiroki Tsuchiura, Makoto Yamashita +1
A superfluid flow beyond a critical momentum in an optical lattice decays drastically by the interplay between nonlinearity due to the interparticle interactions in Bose-Einstein c…
Mott Transition and Spin Structures of Spin-1 Bosons in Two-Dimensional Optical Lattice at Unit Filling
Yuta Toga, Hiroki Tsuchiura, Makoto Yamashita +2
We study the ground state properties of spin-1 bosons in a two-dimensional optical lattice, by applying a variational Monte Carlo method to the S=1 Bose-Hubbard model on a square l…