Nd Rich Nd-Fe-B Tailored for Maximum Coercivity

1999 ◽  
Vol 577 ◽  
Author(s):  
Er. Girt ◽  
Kannan M. Krishnan ◽  
G. Thomas ◽  
C. J. Echer ◽  
Z. Altounian
Keyword(s):  
Domain Wall ◽  
Coercive Field ◽  
Magnetization Curves ◽  
Pinning Mechanism ◽  
Initial Magnetization ◽  
Domain Wall Pinning

ABSTRACTThe coercive field, He, in rapidly quenched Nd-Fe-B was found to increase for samples with excess of Nd. In addition, Hc, strongly depends on the Fe/B ratio, increasing from 1.67 T for Fe/B = 1.07 to 2.05 T for Fe/B = 14.6 in Nd30(Fe,B)70. The increase in Hc seems to correlate with an increase of the γ-Nd phase in the sample. The initial magnetization curves of Nd30(Fe,B)70 show that the domain wall pinning plays a more important role as the Fe/B ratio increases. Thus, γ-Nd may play an important role in promoting a pinning mechanism. The excess of Nd in rapidly quenched Nd-Fe-B samples was also found to promote growth of Nd2Fe14B grains elongated in shape.

Initial Magnetization Behavior of Rapidly Quenched Neodymium-Iron-Boron Magnets

1987 ◽  
Vol 96 ◽  
Author(s):  
F. E. Pinkerton
Keyword(s):  
Grain Size ◽  
Domain Wall ◽  
Domain Walls ◽  
Initial Permeability ◽  
Single Domain ◽  
Initial Magnetization ◽  
Domain Wall Pinning ◽  
Rapidly Solidified ◽  
Coercivity Mechanism ◽  
Magnetization Behavior

ABSTRACTInitial magnetization and demagnetization data are reported for three forms of rapidly solidified Nd-Fe-B permanent magnet materials: melt-spun ribbons, hot pressed magnets, and die upset magnets. In all three materials the results are consistent with domain wall pinning at grain boundary phases as the coercivity mechanism. Optimally quenched ribbons are comprised of randomly oriented single domain Nd2Fe14B grains, and both initial magnetization and demagnetization are controlled by strong domain wall pinning at grain boundaries. Maximum coercivity is accompanied by a low initial permeability. Coercivity is reduced in overquenched ribbons by partial retention of a magnetically soft amorphous or very finely crystalline microstructure. Coercivity decreases in underquenched ribbons because wall pinning weakens as the grain size increases above optimum. Correlation of magnetization and demagnetization behaviors suggests that maximum coercivity in ribbons is largely determined by the resistance to domain wall formation in grains smaller than the single domain particle limit. Grain size is much less important in the aligned die upset magnets. Domain walls are initially free to move until they become strongly pinned at grain edges, and complete magnetization requires an applied field greater than the coercive field. Hot pressed magnets show a mixture of ribbon and die upset behavior.

Micromagnetic study of domain-wall pinning characteristics with grooves in thin films

2005 ◽  
Vol 97 (10) ◽  
pp. 10E317 ◽  
Author(s):  
H. Asada ◽  
H. Ii ◽  
J. Yamasaki ◽  
M. Takezawa ◽  
T. Koyanagi
Keyword(s):  
Thin Films ◽  
Domain Wall ◽  
Domain Wall Pinning

Domain-wall pinning in uniaxial phases of Pb adlayers on a Cu(110) surface

1990 ◽  
Vol 65 (24) ◽  
pp. 3025-3028 ◽  
Author(s):  
K. S. Liang ◽  
K. L. D’Amico ◽  
C. H. Lee ◽  
E. Y. Sheu
Keyword(s):  
Domain Wall ◽  
Domain Wall Pinning

scholarly journals Reduced domain wall pinning in ultrathin Pt/Co100−xBx/Pt with perpendicular magnetic anisotropy

2010 ◽  
Vol 96 (2) ◽  
pp. 022501 ◽  
Author(s):  
R. Lavrijsen ◽  
G. Malinowski ◽  
J. H. Franken ◽  
J. T. Kohlhepp ◽  
H. J. M. Swagten ◽  
...  
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Domain Wall Pinning

scholarly journals Nanoscale modification of magnetic properties for effective domain wall pinning

2019 ◽  
Vol 475 ◽  
pp. 70-75 ◽  
Author(s):  
Tianli Jin ◽  
Funan Tan ◽  
Wai Cheung Law ◽  
Weiliang Gan ◽  
Ivan Soldatov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Domain Wall ◽  
Domain Wall Pinning ◽  
Effective Domain

scholarly journals The study of domain-wall pinning by inhomogeneities in nanocrystalline permanent magnets

2003 ◽  
Vol 52 (3) ◽  
pp. 708
Author(s):  
Rong Chuan-Bing ◽  
Zhang Hong-Wei ◽  
Zhang Jian ◽  
Zhang Shao-Ying ◽  
Shen Bao-Gen
Keyword(s):  
Domain Wall ◽  
Permanent Magnets ◽  
Domain Wall Pinning
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