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

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3787

Lastpage

3789

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]. Sm_1-x-yCo_xC _y nanocrystals have been produced using a Sm₂Co ₇ precursor, as have nanocrystalline Fe_1-x-y-zNd _xB_yC_z using Fe₁₄Nd₂B. 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; Fe_1-x-y-zNd_xB_yC_z; FeNdBC; HRTEM; Kratschmer-Huffman C-arc method; MRI image enhancement; RE/TM fine particle ferromagnets; SQUID magnetometry; Sm_1-x-yCo_xC_y 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489772

Filename

489772