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Magnetic properties and microstructural observations of oxide coated FeCo nanocrystals before and after compaction (1999)

Turgut, Z. ; Nuhfer, N. T. ; Piehler, H. R. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 85 (1999), S. 4406-4408

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: A radio frequency (rf) plasma torch has been used to produce FeCo nanoparticles with a thin protective oxide coating from metal powder precursors. Structural characterization by conventional and synchrotron x-ray diffraction indicated a disordered bcc α-FeCo phase. High resolution transmission electron microscopy revealed spherical particles with several monolayer thick protective oxide coatings. Thermomagnetic measurements were carried out using a superconducting quantum interference device magnetometer and a vibrating sample magnetometer at temperatures between 5 and 1050 K. Antiferromagnetic (exchange bias) coupling was observed due to the presence of the oxide layer. Relatively high coercivities were observed (280 Oe at 5 K and 250 Oe at room temperature). Néel's surface (interface) anisotropy model was employed to explain the origin of the observed coercivities. As produced powders were hot isostatically pressed at 1023 K and 22 ksi for 2 h. Dense structures were observed and compacted particles revealed coercivities as low as 25 Oe at room temperature. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.369799

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