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Start Over Author "Verhoef R" Journal journal of magnetism and magnetic materials
19 results on '"Verhoef R"'

12. Magnetic properties of Er2Fe14−xMnxC

Author

Verhoef, R., de Boer, F.R., Franse, J.J.M., Denissen, C.J.M., Jacobs, T.H., and Buschow, K.H.J.

Abstract

The magnetic properties of the compounds Er2Fe14−xMnxhave been determined by means of X-ray diffraction, magnetic measurement and 57Fe Mössbauer spectroscopy. Magnetization measurements made in fields up to 38 T showed that the saturation moment exhibits a minimum at a Mn concentration corresponding to about x=2, due to the antiparallel coupling between the R and 3d sublattice magnetizations the latter becoming strongly reduced with increasing Mn concentration. The reduction of the 3d-sublattice magnetization is accompnied by a corresponding reduction in the 57FE hyperfine fields and by a lowering of the Curie temperature and the spin orientation temperature. Most of the compounds investigated have a break in the magnetization curves measured at 4.2 K which is interpreted as the onset of decoupling between the antiparallel rare earth and 3d sublattices. A mean field analysis was used to derive the intersublattice molecular field coefficient nRT.

Published
1989
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13. Magnetic anisotropy in Pr2Fe14−xMnxC compounds

Author

Verhoef, R., de Boer, F.R., Fu-ming, Yang, Zhi-dong, Zhang, de Mooij, B.D., and Buschow, K.H.J.

Abstract

The concentration dependence of the magnetic properties of Pr2Fe14−xMnxC, 0.3≤x≤10, compounds has been in Mn substitution leads to a decrease of the saturation moment, accompanied by a strong reduction of the Curie temperature. Anisotropy constants have been deduced from an analysis of high-field magnetisation isotherms at 4.2 K. First-order magnetisation processes (FOMP) have been observed.

Published
1989
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14. Magnetization reversal in microscopic NdFeB single crystals

Author

Richter, H.J., Hempel, K.A., and Verhoef, R.

Abstract

Using a very high sensitive magnetometer the magnetization reversal of very small isolated NdFeB single crystals (μm range and below) is investigated. It turns out that similarities in the hysteresis cycle between barium ferrite single crystals and the Nd compounds can be observed. Sample size and morphology are controlled using an electron scanning microscope. While in ferrite samples of the range 1 μm single domain behaviour can be observed, the Nd2Fe14B samples still show evidence of domain wall motions.

Published
1989
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