Hard ferromagnetism in melt-spun Hf2Co11B alloys

Michael A. McGuire; Orlando Rios; Nirmal J. Ghimire; Michael Koehler

doi:10.1063/1.4766283

Hard ferromagnetism in melt-spun Hf₂Co₁₁B alloys

Michael A. McGuire, Orlando Rios, Nirmal J. Ghimire, Michael Koehler

Correlated Electron Materials

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

39 Scopus citations

Abstract

Hard ferromagnetic behavior is reported for crystalline Hf ₂ Co₁₁ B produced by melt-spinning. For the highest-performing material, remanent magnetization, intrinsic coercive field, and maximum energy product at room temperature are 6.2 kG, 4.5 kOe, and 6.7 MGOe, respectively. This is the highest reported energy product for this class of alloys, and is about half that of optimized Nd₂ Fe₁₄ B ribbons. The Curie temperature of both crystalline and amorphous Hf₂ Co₁₁ B is near 770 K. The results suggest further optimization of magnetic properties should be attainable, and indicate Hf₂ Co₁₁ B to be a promising material for rare-earth-free permanent magnets.

Original language	English
Article number	202401
Journal	Applied Physics Letters
Volume	101
Issue number	20
DOIs	https://doi.org/10.1063/1.4766283
State	Published - Nov 12 2012

Funding

We thank Cecil A. Carmichael for use of and assistance with the melt-spinner. Research sponsored by the U.S. Department of Energy, Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, as part of the Propulsion Materials Program (M.A.M, N.J.G., and O.R.). Microscopy work supported by ORNL SHaRE, Division of Scientific User Facilities, Office of Basic Energy Sciences, U. S. Department of Energy. High temperature magnetization measurements at The University of Tennessee (M.K.) supported by DOD DEPSCoR Grant No. N00014-08-1-0783.

Funders	Funder number
Division of Scientific User Facilities
Office of Basic Energy Sciences
U. S. Department of Energy
U.S. Department of Defense
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory
University of Tennessee
Vehicle Technologies Office

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abstract = "Hard ferromagnetic behavior is reported for crystalline Hf 2 Co11 B produced by melt-spinning. For the highest-performing material, remanent magnetization, intrinsic coercive field, and maximum energy product at room temperature are 6.2 kG, 4.5 kOe, and 6.7 MGOe, respectively. This is the highest reported energy product for this class of alloys, and is about half that of optimized Nd2 Fe14 B ribbons. The Curie temperature of both crystalline and amorphous Hf2 Co11 B is near 770 K. The results suggest further optimization of magnetic properties should be attainable, and indicate Hf2 Co11 B to be a promising material for rare-earth-free permanent magnets.",

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N2 - Hard ferromagnetic behavior is reported for crystalline Hf 2 Co11 B produced by melt-spinning. For the highest-performing material, remanent magnetization, intrinsic coercive field, and maximum energy product at room temperature are 6.2 kG, 4.5 kOe, and 6.7 MGOe, respectively. This is the highest reported energy product for this class of alloys, and is about half that of optimized Nd2 Fe14 B ribbons. The Curie temperature of both crystalline and amorphous Hf2 Co11 B is near 770 K. The results suggest further optimization of magnetic properties should be attainable, and indicate Hf2 Co11 B to be a promising material for rare-earth-free permanent magnets.

AB - Hard ferromagnetic behavior is reported for crystalline Hf 2 Co11 B produced by melt-spinning. For the highest-performing material, remanent magnetization, intrinsic coercive field, and maximum energy product at room temperature are 6.2 kG, 4.5 kOe, and 6.7 MGOe, respectively. This is the highest reported energy product for this class of alloys, and is about half that of optimized Nd2 Fe14 B ribbons. The Curie temperature of both crystalline and amorphous Hf2 Co11 B is near 770 K. The results suggest further optimization of magnetic properties should be attainable, and indicate Hf2 Co11 B to be a promising material for rare-earth-free permanent magnets.

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Hard ferromagnetism in melt-spun Hf₂Co₁₁B alloys

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