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Magnetic force microscopy characterization of unusual magnetic coupling in an extraordinarily responsive magnetic material

Leib, J., Lo, C. C. H., Snyder, John Evan, Jiles, David, Pecharsky, V. K., Schlagel, D. S. and Lograsso, T. A. 2002. Magnetic force microscopy characterization of unusual magnetic coupling in an extraordinarily responsive magnetic material. IEEE Transactions on Magnetics 38 (5) , 2447 -2449. 10.1109/TMAG.2002.803587

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Gd5(Si2Ge2) and related compounds with similar (nearly equal Si-to-Ge ratio) composition exhibit large magnetoresponsive properties including a giant magnetocaloric effect, colossal magnetostriction, and giant magnetoresistance near a structural-magnetic phase transition that occurs close to ambient temperature. Magnetic force microscopy (MFM) and vibrating sample magnetometry (VSM) measurements on single-crystal samples of these materials indicate that the easy magnetization axis is the b-axis of the orthorhombic magnetic phase-perpendicular to the slabs. In fact, the MFM image of a surface perpendicular to the b-axis is quite similar to domain patterns perpendicular to the easy axis of Co and other highly anisotropic magnetic materials. Therefore, it appears that Gd5(SixGe1-x)4 may require modeling similar to other multilayers and superlattices of rare-earth metals with one or more nonmagnetic constituents that exhibit long-range magnetic order across nonmagnetic layers. Many of the important phenomena of these Gd compounds could be explained by the interaction of localized Gd magnetic moments across the covalent bonding between atomic slabs, adapting models already suggested for other similar materials.

Item Type: Article
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Ferromagnetic materials; gadolinium alloys; germanium alloys; giant magnetoresistance; local moments; magnetic anisotropy; magnetic domains; magnetic force microscopy; magnetic hysteresis; magnetic structure; magnetocaloric effects; magnetostriction; silicon alloys
Publisher: IEEE
ISSN: 0018-9464
Last Modified: 04 Jun 2017 02:02

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