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Coercivity mechanism of La-Nd-Fe-B films with Y spacer layer
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作者 马俊 赵晓天 +4 位作者 刘伟 李阳 刘龙 赵新国 张志东 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期138-143,共6页
The effect of the Y spacer layer on the phase composition,coercivity,and magnetization reversal processes of La-Nd-Fe-B films has been investigated.The addition of a 10 nm Y spacer layer increases the coercivity of th... The effect of the Y spacer layer on the phase composition,coercivity,and magnetization reversal processes of La-Nd-Fe-B films has been investigated.The addition of a 10 nm Y spacer layer increases the coercivity of the film to 1.36 T at 300 K and remains 0.938 T at 380 K.As the thickness of the Y spacer layer increases,Y participates in the formation of the main phase in the film,and further regulates the formation of La-B phases.The results of the first-order reversal curve(FORC)and micromagnetic fitting show that the coercivity of all the films is dominated by nucleation mechanism.The c-axis preferred orientation,good magnetic microstructure parameters and the largest dipole interaction enhance the coercivity.Therefore,the introduction of the Y spacer layer can be an effective way to improve the coercivity of La-Nd-Fe-B film over a wide temperature range of 150 K-380 K. 展开更多
关键词 La-Nd-(Y)-Fe-B films magnetization reversal mechanisms COERCIVITY MULTILAYERS
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Magnetization Reversal for Ni Nanowires Studied by Micromagnetic Simulations
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作者 Nianmei Hen Guanghua Guo +2 位作者 Lamei Zhang Guangfu Zhang Wenbin Song 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2009年第2期151-154,共4页
The magnetization reversal mechanisms for Ni nanowires with different diameters were investigated by micromagnetic simulations. The results show that the reversal mechanisms are significantly dependeht on the diameter... The magnetization reversal mechanisms for Ni nanowires with different diameters were investigated by micromagnetic simulations. The results show that the reversal mechanisms are significantly dependeht on the diameter of wire. For very thin wires, the reversal occurs by pseudo-coherent rotation. With increasing diameter, magnetization reversal takes place via different nucleation (the transverse domain wall and the vortex domain wall) and subsequent propagation. The reason of transition from the transverse domain wall to the vortex domain wall is given by analytical studies. With further increase of the diameter, the reversal nuclear domain wall becomes tundishoshaped form. As the diameter increases, the width of wall becomes larger. 展开更多
关键词 NANOWIRE MICROMAGNETICS magnetization reversal mechanism
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Effects of dipolar interactions on magnetic properties of Co nanowire arrays 被引量:1
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作者 李洪健 岳明 +5 位作者 吴琼 彭懿 李玉卿 刘卫强 张东涛 张久兴 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第11期481-485,共5页
Magnetic properties and magnetization processes of Co nanowire arrays with various packing densities are investigated by means of object-oriented micromagnetic framework(OOMMF) software package with finite differenc... Magnetic properties and magnetization processes of Co nanowire arrays with various packing densities are investigated by means of object-oriented micromagnetic framework(OOMMF) software package with finite difference micromagnetic simulations. The packing density of nanowires is changed with the diameter, number of nanowires and center-to-center spacing between the wires. The magnetization reversal mechanism and squareness of the hysteresis loops of the nanowire arrays are very sensitive to the packing density of nanowires. Clear steps and plateaux on the demagnetization are visible,which turns out that dipolar interactions among the wires have a significant influence on switching field. 展开更多
关键词 micromagnetic simulations cobalt nanowires magnetization reversal mechanism magnetic properties
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Efect of Varying Dzyaloshinskii–Moriya Interaction on the Bistable Nano-Scale Soliton Switching
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作者 L.Kavitha M.Saravanan +1 位作者 V.Senthilkumar D.Gopi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第12期658-662,共5页
The effect of Dzyaloshinskii-Moriya (D-M) interaction on the bistable nano-scale soliton switching offers the possiblity of developing a new innovative approach for data storage technology. The dynamics of Heisenber... The effect of Dzyaloshinskii-Moriya (D-M) interaction on the bistable nano-scale soliton switching offers the possiblity of developing a new innovative approach for data storage technology. The dynamics of Heisenberg ferromagnetic spin system is expressed in terms of generalized inhomogeneous higher order nonlinear Schr6dinger (NLS) equation. The bistable soliton switching in the ferromagnetic medium is established by solving the associated coupled evolution equations for amplitude and velocity of the soliton using the fourth order Runge-Kutta method numerically. 展开更多
关键词 SOLITONS magnetization reversal mechanisms perturbation theory exchange interactions
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