Van der Waals magnet VI_(3) demonstrates intriguing magnetic properties that render it great for use in various applications.However,its microscopic magnetic structure has not been determined yet.Here,we report neutro...Van der Waals magnet VI_(3) demonstrates intriguing magnetic properties that render it great for use in various applications.However,its microscopic magnetic structure has not been determined yet.Here,we report neutron diffraction and susceptibility measurements in VI_(3) that revealed a ferromagnetic order with the moment direction tilted from the c-axis by ~36° at 4 K.A spin reorientation accompanied by a structure distortion within the honeycomb plane is observed,before the magnetic order completely disappears at TC=50 K.The refined magnetic moment of ~1.3μB at 4 K is much lower than the fully ordered spin moment of 2μB/V^(3+),suggesting the presence of a considerable orbital moment antiparallel to the spin moment and strong spin-orbit coupling in VI_(3).This results in strong magnetoelastic interactions that make the magnetic properties of VI_(3) easily tunable via strain and pressure.展开更多
An enhanced giant magnetoimpedance(GMI)effect of Fe-based amorphous ribbons is obtained by rapid heat treatment.The structural investigations on the ribbon reveal the presence of two phases,i.e.a fine grained Fe3Si ph...An enhanced giant magnetoimpedance(GMI)effect of Fe-based amorphous ribbons is obtained by rapid heat treatment.The structural investigations on the ribbon reveal the presence of two phases,i.e.a fine grained Fe3Si phase and a residual amorphous phase on rapid heat treatment.The soft magnetic property is improved by rapid heat treatment;the crystal size and grain size of Fe_(3)Si decrease.The maximum magnetoimpedance ratio obtained in the present study is 81%at 10 MHz,and the optimized heat-treated rate is 200℃/min.Separated GMI curves are observed after the simultaneous rapid heat treatment and magnetic field annealing.This suggests that tailoring of the nanocrystalline microstructures induced by optimum rapid heat treatment conditions can result in an excellent GMI effect.展开更多
基金Supported by the Innovation Program of Shanghai Municipal Education Commission(Grant No.2017-01-07-00-07-E00018)the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01)+1 种基金the National Natural Science Foundation of China(Grant No.11874119)the support of U.S.DOE BES Early Career Award No.KC0402020 under Contract No.DE-AC05-00OR22725。
文摘Van der Waals magnet VI_(3) demonstrates intriguing magnetic properties that render it great for use in various applications.However,its microscopic magnetic structure has not been determined yet.Here,we report neutron diffraction and susceptibility measurements in VI_(3) that revealed a ferromagnetic order with the moment direction tilted from the c-axis by ~36° at 4 K.A spin reorientation accompanied by a structure distortion within the honeycomb plane is observed,before the magnetic order completely disappears at TC=50 K.The refined magnetic moment of ~1.3μB at 4 K is much lower than the fully ordered spin moment of 2μB/V^(3+),suggesting the presence of a considerable orbital moment antiparallel to the spin moment and strong spin-orbit coupling in VI_(3).This results in strong magnetoelastic interactions that make the magnetic properties of VI_(3) easily tunable via strain and pressure.
基金Supported by the National Basic Research Program of China under Grant No 2012CB933101the National Natural Science Foundation of China under Grant Nos 11074101,51171075+1 种基金the Fundamental Research Funds for the Central Universities under Grant Nos lzujbky-2012-k29,lzujbky-2012-209the Program for New Century Excellent Talents in University.
文摘An enhanced giant magnetoimpedance(GMI)effect of Fe-based amorphous ribbons is obtained by rapid heat treatment.The structural investigations on the ribbon reveal the presence of two phases,i.e.a fine grained Fe3Si phase and a residual amorphous phase on rapid heat treatment.The soft magnetic property is improved by rapid heat treatment;the crystal size and grain size of Fe_(3)Si decrease.The maximum magnetoimpedance ratio obtained in the present study is 81%at 10 MHz,and the optimized heat-treated rate is 200℃/min.Separated GMI curves are observed after the simultaneous rapid heat treatment and magnetic field annealing.This suggests that tailoring of the nanocrystalline microstructures induced by optimum rapid heat treatment conditions can result in an excellent GMI effect.
