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Magnetic Domains and Domain Wall Pinning in Nanocrystalline Ni-P

Published online by Cambridge University Press:  02 July 2020

J.P. Zhang ,
Y.X. Guo  and
J.S. Speck
J.P. Zhang
Affiliation:
Materials Department, University of California, Santa Barbara, CA93106
Y.X. Guo
Affiliation:
E&PS, Univ. of New Mexico, Albuquerque, NM , 87131 / now at Intel Corporation, New Mexico
J.S. Speck
Affiliation:
Materials Department, University of California, Santa Barbara, CA93106
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Abstract

Magnetic domain structures in a Ni-5at%P alloy have been examined using Lorentz microscopy in Fresnel mode in a JEOL 2010TEM. with electron diffraction and high resolution electron imaging, the Ni-P alloy material is seen to be of FCC structure and composed of nanometer-sized grains (< 4nm in diameter), which is about 2 orders less in size than that of a single magnetic domain.

The TEM specimen was prepared using jet polishing method. Before introducing the specimen into the microscope, the objective lens was turned off in a free lens control mode to ensure that the domain structures in the specimen remain unaffected. The objective mini-lens was used to perform Lorentz imaging with out-focus method.

Stripe domains were observed. The width of these stripes is about 0.2 micron. But the length of these domains varies, sometime up to several microns. The stripe domains are grouped, which are near parallel one to the other.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1242 - 1243
Copyright
Copyright © Microscopy Society of America 2001

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References

References:

[1]Hirsch, P.B. et al., “Electron Microscopy of Thin Crystals”, Krieger, 1977.Google Scholar
[2]Tebble, R.S., Proc. of Inter. Conf. On Magnetism, Nottingham 1964, P859.Google Scholar