Some Superparamagnetic Properties of Fine Particle δFeOOH
- 1 March 1962
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 33 (3) , 1203-1205
- https://doi.org/10.1063/1.1728659
Abstract
Various samples of δFeOOH have been prepared all with substantially the same particle shape and size but with differing low-temperature saturation magnetizations. The particles were found to be hexagonal platelets with a mean diameter of 200 A and a thickness of 30 A. The magnetization of the samples was varied by varying the preparation conditions and also by partially decomposing the material to αFeOOH and αFe2O3. It has been shown that at a little above room temperature the powders were all superparamagnetic and that the variations of magnetization with preparation conditions qualitatively support a model proposed by Francombe and Rooksby. The variation of the Blocking temperature of a particular preparation as its magnetization was reduced by successive decomposition is also discussed. The results are tentatively interpreted in terms of a constant term corresponding to the normal anisotropy energy and a variable one due to the Lorentz internal field.This publication has 5 references indexed in Scilit:
- SuperparamagnetismJournal of Applied Physics, 1959
- Structure Transformations Effected by the Dehydration of Diaspore, Goethite and Delta Ferric OxideClay Minerals, 1959
- The Oxides and Hydroxides of Iron and Their Structural Inter-RelationshipsClay Minerals, 1959
- Some New Results on Antiferromagnetism and FerromagnetismReviews of Modern Physics, 1953
- Über eine neue, ferromagnetische Modifikation des Eisen (III)‐oxydsZeitschrift für anorganische und allgemeine Chemie, 1939