Title :
Magnetic hysteresis and rotational energy barriers in C-coated Co and RE/TM fine particle ferromagnets
Author :
McHenry, Michael E. ; Brunsman, E.U. ; Majetich, S.A.
Author_Institution :
Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
We use a Kratschmer-Huffman C-arc method to synthesize C-coated transition metal (TM) and rare earth (RE)-TM nanocrystals. The theme of this research is C-arc synthesis of magnetic materials and assessment of potential use in xerography, ferrofluids, data storage, MRI image enhancement, etc. Here we focus on materials with potential for data storage, TM particles include Co[C]. Sm1-x-yCoxC y nanocrystals have been produced using a Sm2Co 7 precursor, as have nanocrystalline Fe1-x-y-zNd xByCz using Fe14Nd2 B. Characterization by XRD and HRTEM identify phases and particle sizes. SQUID magnetometry is used to determine magnetic hysteresis, temperature, and time dependent response
Keywords :
X-ray diffraction; boron alloys; carbon; coatings; cobalt; cobalt alloys; ferromagnetic materials; iron alloys; magnetic hysteresis; magnetic particles; magnetic storage; materials preparation; nanostructured materials; neodymium alloys; particle size; samarium alloys; transmission electron microscopy; C; C-coated Co; Co; Fe1-x-y-zNdxByCz; FeNdBC; HRTEM; Kratschmer-Huffman C-arc method; MRI image enhancement; RE/TM fine particle ferromagnets; SQUID magnetometry; Sm1-x-yCoxCy nanocrystals; Sm2Co7 precursor; SmCoC; XRD; characterization; data storage; ferrofluids; magnetic hysteresis; magnetic materials; nanocrystals; particle sizes; rotational energy barriers; synthesis; temperature; time dependent response; xerography; Electrophotography; Energy barrier; Image enhancement; Iron; Magnetic hysteresis; Magnetic materials; Magnetic resonance imaging; Memory; Nanocrystals; Neodymium;
Journal_Title :
Magnetics, IEEE Transactions on
