TY - JOUR
T1 - First-principles study of interface magnetic structure in Nd2Fe14 B/(Fe,Co) exchange spring magnets
AU - Umetsu, Nobuyuki
AU - Sakuma, Akimasa
AU - Toga, Yuta
N1 - Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/1/8
Y1 - 2016/1/8
N2 - The magnetic properties of Nd2Fe14B (NFB)/transition metal (TM = Fe, Co) multilayer systems are studied on the basis of first-principles density functional calculations. Assuming a collinear spin structure, we optimize the model structure under a variety of crystallographic alignments of the NFB layer, and analyze the mechanism of interface magnetic coupling. Improvements in remanent magnetization compared to that of single NFB are observed in NFB(001)/Fe, NFB(110)/Fe, and NFB(100)/Co. On the other hand, in NFB(100)/Fe, remanence degradation due to the antiparallel magnetization alignment between NFB and Fe layers is observed. In this system, which has the shortest optimized interlayer distance among all considered systems, an itinerant electron magnetism is required around the interface to lower the total energy, and accordingly, antiferromagnetic coupling is preferred. The significant difference in property between NFB(100)/Fe and NFB(100)/Co is attributed to the difference between their interface structures, optimized interlayer distances, and magnetic stiffness of TM layers.
AB - The magnetic properties of Nd2Fe14B (NFB)/transition metal (TM = Fe, Co) multilayer systems are studied on the basis of first-principles density functional calculations. Assuming a collinear spin structure, we optimize the model structure under a variety of crystallographic alignments of the NFB layer, and analyze the mechanism of interface magnetic coupling. Improvements in remanent magnetization compared to that of single NFB are observed in NFB(001)/Fe, NFB(110)/Fe, and NFB(100)/Co. On the other hand, in NFB(100)/Fe, remanence degradation due to the antiparallel magnetization alignment between NFB and Fe layers is observed. In this system, which has the shortest optimized interlayer distance among all considered systems, an itinerant electron magnetism is required around the interface to lower the total energy, and accordingly, antiferromagnetic coupling is preferred. The significant difference in property between NFB(100)/Fe and NFB(100)/Co is attributed to the difference between their interface structures, optimized interlayer distances, and magnetic stiffness of TM layers.
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U2 - 10.1103/PhysRevB.93.014408
DO - 10.1103/PhysRevB.93.014408
M3 - Article
AN - SCOPUS:84955251787
SN - 2469-9950
VL - 93
JO - Physical Review B
JF - Physical Review B
IS - 1
M1 - 014408
ER -