62 citations · 220 across the 12 of their papers we have counts for
5 papers · 1 filter
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…