{open_quotes}Exchange-spring{close_quotes} Nd{endash}Fe{endash}B alloys: Investigations into reversal mechanisms and their temperature dependence
- Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
- Magnequench International (MQI), Incorporated, 6435 Scatterfield Road, Anderson, Indiana 46013 (United States)
In order to investigate factors affecting coercivity a series of two-phase Nd{sub 2}Fe{sub 14}B-based nanocomposite alloys with different excess iron concentrations were produced by melt-spinning methods. The constituent grain size was estimated by diffraction methods to be in the range of 150{endash}500 {Angstrom}, and room-temperature demagnetization curves verify that the alloys studied exhibit a modest remanence enhancement. Isothermal remanence magnetization (IRM) and dc demagnetization (DCD) measurements performed at temperatures in the range 275K{le}T{le}350K illustrate that the coercivity and irreversible magnetization develop in a bimodal, incoherent manner from a demagnetized state but upon demagnetization from a saturated state the system evinces collective, exchange-coupled behavior as illustrated by the reversible magnetization M{sub rev}. The temperature dependencies and values of the irreversible susceptibility {chi}{sub irr} (DCD) suggest that a moderating phase with a magnetic anisotropy intermediate to the two constituent main phases may be present in the alloys. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 496478
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016175
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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