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Asymmetric dynamic behaviors of magnetic domain wall in trapezoid-cross-section nanostrip

Chinese Physics B 2020年第9期29卷 518-522页

作者： Xiao-Ping Ma Hong-Guang Piao Lei Yang Dong-Hyun Kim Chun-Yeol You Liqing Pan Research Institute for Magnetoelectric&Weak magnetic-field Detection College of ScienceChina Three Gorges UniversityYichang 443002China Department of Physics Chungbuk National UniversityCheongju 28644ChungbukRepublic of Korea Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea

Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes.

关键词： ferromagnetic nanowire magnetic domain wall geometric effect asymmetric Walker breakdown

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Revisiting the pinning sites in 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets

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Journal of Rare Earths 2021年第12期39卷 1560-1566,I0004页

作者： Xianglong Zhou Yao Liu Wentao Jia Xin Song Andong Xiao Tao Yuan Fang Wang Jiuping Fan Tianyu Ma State Key Laboratory for Mechanical Behavior of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterFrontier Institute of Science and TechnologyXi'an Jiaotong University The Southwest Applied Magnetism Research Institute Key Laboratory of magnetic Molecules and magnetic Information Materials of the Ministry of Education

It is still an open debate whether the 1:5 H cell boundaries(CBs)or the intersections of 1:3 R platelets and1:5 H CBs are the strong pining sites for the cellular nanostructured 2:17-type Sm-Co-Fe-Cu-Zr high temperature permanent magnets despite that they have been widely applied in advanced industries since 1970 ***,through tuning the volume fraction of Zr-enriched 1:3 R platelets by varying the second-step aging time,the pinning behavior in a model magnet Sm_(2.5)Co_(44.9)Fe_(21.5)Cu_(5.6)Zr_(3.0)(wt%)was *** results show that the volume fraction of 1:3 R platelets can be effectively enlarged without changing the cell size(*** volume fraction of CBs)by extending the aging time at 400℃.Micro scopic TEM characterizations co mbined with macro scopic magnetic measurements reveals that the locally thickened 1:3 R platelets after long-term second-step aging reduce the effective pinning area by interrupting the magnetic domain walls at CBs,weakening the average pinning strength and the coercivity of the ***,our work supports that the 1:5 H CBs act as the dominating pinning sites instead of the intersections of 1:3 R platelets and 1:5 H CBs,which may provide an important insight towards understanding the hard magnetism of pinning-controlled permanent magnets.

关键词： Rare earths Sm-Co magnet magnetic properties magnetic domain wall

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