Hybrid high-temperature nanostructured magnets

David J. Sellmyer, J. Zhou, H. Tang, R. Skomski

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

The hysteretic behavior of two-phase permanent magnets for high-temperature applications is examined. A variety of systems have been synthesized and investigated, including Sm-Co-Cu-Ti bulk magnets, SmCo5:Cu-Ti thin-film materials, and mechanically milled Sm-Co-Zr magnets. The hybrid character of the material leads to very high room-temperature coercivities, between 30.2 and 43.6 kOe, and to the survival of a comparatively large part of the coercivity at high temperatures (12.3 kOe at 500°C for SmCo6.5Cu0.8Ti0.3). The coercivity reflects the structure and chemical composition of the material. When ferromagnetic grains are separated by a ferromagnetic boundary phase, the boundary phase acts as a pinning center, but when the grain-boundary phase has a comparatively low Curie temperature, the high-temperature magnetism of the system is that of a weakly interacting ensemble of magnetic particles. In spite of some residual paramagnetic exchange coupling, which is discussed in this work, this mechanism enhances the coercivity.

Original languageEnglish (US)
Pages (from-to)U5.8.1-U5.8.12
JournalMaterials Research Society Symposium - Proceedings
Volume674
DOIs
StatePublished - 2001
EventApplications of Ferromagnetic and Optical Materials, Storage and Magnotoelectronics - San Francisco, CA, United States
Duration: Apr 16 2001Apr 20 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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