Location and morphology of ferromagnetic precipitates in Ni-Mn-Sn

被引:0
|
作者
Josten, Nicolas [1 ,2 ]
Franzka, Steffen [3 ]
Rao, Ziyuan [4 ]
Smoliarova, Tatiana [1 ,2 ]
Kovacs, Andras [5 ,6 ]
Scheibel, Franziska [7 ]
Staab, Franziska [8 ]
Acet, Mehmet [1 ,2 ]
Cakir, Asli [9 ]
Durst, Karsten [8 ]
Gault, Baptiste [4 ,10 ]
Dunin-Borkowski, Rafal E. [5 ,6 ]
Gutfleisch, Oliver [7 ]
Farle, Michael [1 ,2 ]
机构
[1] Univ Duisburg Essen, Fac Phys, D-47057 Duisburg, Germany
[2] Univ Duisburg Essen, Ctr Nanointegrat CENIDE, D-47057 Duisburg, Germany
[3] Interdisciplinary Ctr Analyt Nanoscale ICAN, Carl Benz Str 199, D-47057 Duisburg, Germany
[4] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
[5] Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany
[6] Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany
[7] Tech Univ Darmstadt, Inst Mat Sci, Funct Mat, Peter Grunberg Str 16, D-64287 Darmstadt, Germany
[8] Tech Univ Darmstadt, Inst Mat Sci, Phys Met, Peter Grunberg Str 2, D-64287 Darmstadt, Germany
[9] Mugla Univ, Dept Met & Mat Engn, TR-48000 Mugla, Turkiye
[10] Imperial Coll, Royal Sch Mines, Dept Mat, London SW7 2AZ, England
关键词
MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; FORCE MICROSCOPY; TRANSFORMATION; DECOMPOSITION;
D O I
10.1103/PhysRevMaterials.7.124411
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ni50Mn45Sn05 heated above 600 K decomposes into ferromagnetic Ni2MnSn precipitates in an antiferromagnetic NiMn matrix. If an external magnetic field is applied during annealing, magnetic hysteresis curves with high coercive fields of up to 5 T can be achieved. The origin of this hysteresis has been attributed to the coupling of the antiferromagnetic matrix with the ferromagnetic precipitates, whose location and morphology were not known. To close this knowledge gap, four samples with varying annealing treatments were investigated using switching magnetization magnetic force microscopy. One sample was additionally analyzed with transmission electron microscopy and atom probe tomography. The decomposition type is identified to be a cellular precipitation starting at grain boundaries and growing into the grains. This leads to a multilayer thin film like lamellar structure with a lamella thickness in the nm range. Our results provide a basis for understanding the magnetic interactions, which lead to the magnetic hysteresis with ultra high coercivity.
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页数:10
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