Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Jiang, N.*; 新居 陽一*; 有沢 洋希*; 齊藤 英治; 大江 純一郎*; 小野瀬 佳文*
Physical Review Letters, 126(17), p.177205_1 - 177205_5, 2021/04
被引用回数：4 パーセンタイル：49.47(Physics, Multidisciplinary)Chirality in a helimagnetic structure is determined by the sense of magnetic moment rotation. We found that the chiral information did not disappear even after the phase transition to the high-temperature ferromagnetic phase in a helimagnet MnP. The 2nd harmonic resistivity 
, which reflects the breaking down of mirror symmetry, was found to be almost unchanged after heating the sample above the ferromagnetic transition temperature and cooling it back to the helimagnetic state. The application of a magnetic field along the easy axis in the ferromagnetic state quenched the chirality-induced . This indicates that the chirality memory effect originated from the ferromagnetic domain walls.
Jiang, N.*; 新居 陽一*; 有沢 洋希*; 齊藤 英治; 小野瀬 佳文*
Nature Communications (Internet), 11, p.1601_1 - 1601_6, 2020/03
被引用回数：27 パーセンタイル：85.73(Multidisciplinary Sciences)A helimagnet is a chiral magnet in which the direction of the magnetic moment spatially rotates in a plane perpendicular to the propagation vector. The sense of the rotation known as spin helicity is a robust degree of freedom of matter and may provide a new concept of magnetic memory if it can be electrically controlled and detected. Here we show that the helicity can be controlled by magnetic fields and electric currents in an itinerant helimagnet MnP. Second-harmonic resistivity measurements allow us to read out the controlled helicity. In contract to an insulating multiferroic magnet, in which spin rotation was shown to be controllable by an electric field, we achieve helicity manipulation by using an electric current in the conducting helimagnet. The controllability of the spin helicity may pave the way to new method of realizing magnetic memories based on the spin internal degrees of freedom.
O
松浦 慧介*; 佐賀山 基*; 上原 周*; 新居 陽一*; 梶本 亮一; 蒲沢 和也*; 池内 和彦*; Ji, S.*; 阿部 伸行*; 有馬 孝尚*
Physica B; Condensed Matter, 536, p.372 - 376, 2018/05
被引用回数：2 パーセンタイル：10.36(Physics, Condensed Matter)We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnVO by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector 
at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.
O
松浦 慧介*; 佐賀山 基*; 上原 周*; 新居 陽一*; 梶本 亮一; 蒲沢 和也*; 池内 和彦*; Ji, S.*; 阿部 伸行*; 有馬 孝尚*
Physical Review Letters, 119(1), p.017201_1 - 017201_6, 2017/07
被引用回数：13 パーセンタイル：66.28(Physics, Multidisciplinary)We investigate the magnetic dynamics in the spinel-type vanadium oxide MnVO. Inelastic neutron scattering around 10 meV and a Heisenberg model analysis have revealed that V
spin-wave modes exist at a lower-energy region than previously reported. The scattering around 20 meV cannot be reproduced with the spin-wave analysis. We propose that this scattering could originate from the spin-orbital coupled excitation. This scattering is most likely attributable to V spin-wave modes, entangled with the orbital hybridization between 
orbitals.
