Effects of high magnetic fields on phase transformations in amorphous nd2 fe14 b

Michael S. Kesler; Brandt A. Jensen; Lin Zhou; Olena Palasyuk; Tae Hoon Kim; Matthew J. Kramer; Ikenna C. Nlebedim; Orlando Rios; Michael A. McGuire

doi:10.3390/magnetochemistry5010016

Effects of high magnetic fields on phase transformations in amorphous nd₂ fe₁₄ b

Michael S. Kesler, Brandt A. Jensen, Lin Zhou, Olena Palasyuk, Tae Hoon Kim, Matthew J. Kramer, Ikenna C. Nlebedim, Orlando Rios, Michael A. McGuire

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

5 Scopus citations

Abstract

We briefly summarize the results from a set of experiments designed to demonstrate the effects of high magnetic fields applied during thermal annealing of amorphous Nd₂ Fe₁₄ B produced through melt-spinning. A custom-built differential scanning calorimeter was used to determine the crystallization temperatures in zero-field and in applied fields of 20 kOe and 90 kOe, which guided subsequent heat treatments to evaluate phase evolution. X-ray diffraction was used for phase identification and transmission electron microscopy was employed for observation of the crystallite size and morphology. Magnetization measurements were also used to evaluate the resulting magnetic phases after thermomagnetic processing. While the applied magnetic fields do not appear to affect the crystallization temperature, significant effects on the kinetics of phase evolution are observed and correlated strongly to the magnetic behavior.

Original language	English
Article number	16
Journal	Magnetochemistry
Volume	5
Issue number	1
DOIs	https://doi.org/10.3390/magnetochemistry5010016
State	Published - Mar 2019

Funding

Acknowledgments: This work is supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. Funding: This work was performed under the auspices of the U.S. DOE with ORNL under contract DE-AC05-00OR22725 and The Ames Laboratory, operated by Iowa State University, under Contract No. DE-AC02-07CH11358.

Funders	Funder number
Critical Materials Institute
U.S. Department of Energy
Advanced Manufacturing Office
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory	DE-AC05-00OR22725
Ames Laboratory	DE-AC02-07CH11358

Keywords

Magnetometry
Nd Fe B
Permanent magnet materials
Thermomagnetic processing
X-ray diffraction

Access to Document

10.3390/magnetochemistry5010016

Cite this

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title = "Effects of high magnetic fields on phase transformations in amorphous nd2 fe14 b",

abstract = "We briefly summarize the results from a set of experiments designed to demonstrate the effects of high magnetic fields applied during thermal annealing of amorphous Nd2 Fe14 B produced through melt-spinning. A custom-built differential scanning calorimeter was used to determine the crystallization temperatures in zero-field and in applied fields of 20 kOe and 90 kOe, which guided subsequent heat treatments to evaluate phase evolution. X-ray diffraction was used for phase identification and transmission electron microscopy was employed for observation of the crystallite size and morphology. Magnetization measurements were also used to evaluate the resulting magnetic phases after thermomagnetic processing. While the applied magnetic fields do not appear to affect the crystallization temperature, significant effects on the kinetics of phase evolution are observed and correlated strongly to the magnetic behavior.",

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AU - Kramer, Matthew J.

AU - Nlebedim, Ikenna C.

AU - Rios, Orlando

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AB - We briefly summarize the results from a set of experiments designed to demonstrate the effects of high magnetic fields applied during thermal annealing of amorphous Nd2 Fe14 B produced through melt-spinning. A custom-built differential scanning calorimeter was used to determine the crystallization temperatures in zero-field and in applied fields of 20 kOe and 90 kOe, which guided subsequent heat treatments to evaluate phase evolution. X-ray diffraction was used for phase identification and transmission electron microscopy was employed for observation of the crystallite size and morphology. Magnetization measurements were also used to evaluate the resulting magnetic phases after thermomagnetic processing. While the applied magnetic fields do not appear to affect the crystallization temperature, significant effects on the kinetics of phase evolution are observed and correlated strongly to the magnetic behavior.

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