Reinvestigation of the intrinsic magnetic properties of (Fe1-xCox)2B alloys and crystallization behavior of ribbons

Authors

• Tej Nath Lamichhane, Iowa State University
• Olena Palasyuk, Ames Laboratory
• Vladimir P. Antropov, Ames Laboratory
• Ivan A. Zhuravlev, University of Nebraska–LincolnFollow
• Kirill Belashchenko, University of Nebraska - LincolnFollow
• Ikenna C. Nlebedim, Ames Laboratory
• Kevin W. Dennis, Ames Laboratory
• Anton Jesche, Iowa State University
• Matthew J. Kramer, Ames Laboratory
• Sergey L. Bud'ko, Iowa State University
• R. William McCallum, Ames Laboratory
• Paul C. Canfield, Iowa State University
• Valentin Taufour, U.S Department of Energy, Iowa State UniversityFollow

Document Type

Article

Date of this Version

11-1-2020

Citation

Journal of Magnetism and Magnetic Materials 513 (2020) 167214

https://doi.org/10.1016/j.jmmm.2020.167214

Comments

U.S. government work

Abstract

New determination of the magnetic anisotropy from single crystals of (Fe_1-xCo_x)2B alloys are presented. The anomalous temperature dependence of the anisotropy constant is discussed using the standard Callen-Callen theory, which is shown to be insufficient to explain the experimental results. A more material specific study using first-principles calculations with disordered moments approach gives a much more consistent interpretation of the experimental data. Since the intrinsic properties of the alloys with x=0.3-0.35 are promising for permanent magnets applications, initial investigation of the extrinsic properties are described, in particular the crystallization of melt spun ribbons with Cu, Al, and Ti additions. Previous attempts at developing a significant hysteresis have been unsuccessful in this system. Our melt-spinning experiment indicates that this system shows rapid crystallization.