The relationship between structure and magnetic properties in nanostructured FePd ferromagnets
- Univ. of Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
- Univ. of Alabama, Tuscaloosa, AL (United States)
FePd L1{sub 0} ferromagnets with ultra-fine microstructures (submicron/nanoscale) have been studied. The powders and thin films with nanoscale microstructure were produced using high energy ball milling and vacuum sputtering, respectively. These ultra-fine grained materials were characterized using TEM, SEM, and X-ray diffraction. The line broadening method was used to estimate the crystallite size and lattice strain of the ball-milled powders with the aid of TEM observation. The magnetic properties of the epoxy-bonded powders, isostatically pressed pellets and the thin films were measured using a vibrating sample magnetometer (VSM). The enhanced coercivities exhibited by these ferromagnets compared to bulk materials are discussed in terms of the mechanism of magnetization reversal operating in these fine-particle aggregates and thin films in the grain size range of D < Dc but well above the superparamagnetic regime. Micromagnetic analysis is applied to discuss the mechanism of coercivity, and a pinning model is proposed in these so-called interaction domain ferromagnets.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 649512
- Report Number(s):
- CONF-980102--
- Journal Information:
- IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt1 Vol. 34; ISSN IEMGAQ; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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