Improving the energy product of hard magnetic materials

J. Sort; S. Suriñach; J. S. Muñoz; M. D. Baró; J. Nogués; G. Chouteau; V. Skumryev; G. C. Hadjipanayis

doi:10.1103/PhysRevB.65.174420

Improving the energy product of hard magnetic materials

J. Sort, S. Suriñach, J. S. Muñoz, M. D. Baró, J. Nogués, G. Chouteau, V. Skumryev, G. C. Hadjipanayis

Department of Physics

Research output: Contribution to journal › Article › Research › peer-review

104 Citations (Scopus)

Abstract

A route toward enhancing the energy product (BH)max of permanent magnetic materials, at room temperature, based on ferromagnetic-(FM-) antiferromagnetic (AFM) exchange interactions has been developed. The exchange coupling, which is induced by ball milling hard magnetic SmCo5 with AFM NiO powders, results in an enhancement of coercivity HC and squareness ratio MR/MS (remnant-saturation magnetizations), which depends on the FM:AFM ratio and the processing conditions. However, the presence of the AFM in the composite results also in a competing effect, i.e., reduction of the overall saturation magnetization, which decreases (BH)max. Nevertheless, it has been found that after an optimization of the FM:AFM ratio and the milling conditions it is possible to achieve an improvement of (BH)max.

Original language	English
Article number	174420
Pages (from-to)	1744201-1744205
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.65.174420
Publication status	Published - 1 May 2002

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title = "Improving the energy product of hard magnetic materials",

abstract = "A route toward enhancing the energy product (BH)max of permanent magnetic materials, at room temperature, based on ferromagnetic-(FM-) antiferromagnetic (AFM) exchange interactions has been developed. The exchange coupling, which is induced by ball milling hard magnetic SmCo5 with AFM NiO powders, results in an enhancement of coercivity HC and squareness ratio MR/MS (remnant-saturation magnetizations), which depends on the FM:AFM ratio and the processing conditions. However, the presence of the AFM in the composite results also in a competing effect, i.e., reduction of the overall saturation magnetization, which decreases (BH)max. Nevertheless, it has been found that after an optimization of the FM:AFM ratio and the milling conditions it is possible to achieve an improvement of (BH)max.",

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Improving the energy product of hard magnetic materials. / Sort, J.; Suriñach, S.; Muñoz, J. S.; Baró, M. D.; Nogués, J.; Chouteau, G.; Skumryev, V.; Hadjipanayis, G. C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 17, 174420, 01.05.2002, p. 1744201-1744205.

Research output: Contribution to journal › Article › Research › peer-review

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AU - Skumryev, V.

AU - Hadjipanayis, G. C.

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AB - A route toward enhancing the energy product (BH)max of permanent magnetic materials, at room temperature, based on ferromagnetic-(FM-) antiferromagnetic (AFM) exchange interactions has been developed. The exchange coupling, which is induced by ball milling hard magnetic SmCo5 with AFM NiO powders, results in an enhancement of coercivity HC and squareness ratio MR/MS (remnant-saturation magnetizations), which depends on the FM:AFM ratio and the processing conditions. However, the presence of the AFM in the composite results also in a competing effect, i.e., reduction of the overall saturation magnetization, which decreases (BH)max. Nevertheless, it has been found that after an optimization of the FM:AFM ratio and the milling conditions it is possible to achieve an improvement of (BH)max.

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