Temperature Dependence of Spontaneous Magnetization in Superparamagnetic Nickel
- 1 March 1961
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 32 (3), S229-S230
- https://doi.org/10.1063/1.2000412
Abstract
The possibility of an anomalous temperature dependence of the spontaneous magnetization of superparamagnetic particles has been the subject of several investigations which are in contradiction. We have investigated nickel particles in the 30–100 A diameter range. These were prepared on silica gel supports in the manner familiar in contact catalysis. The spontaneous magnetization in these small particles is slightly but measurably lower than that of massive nickel. The calculated Curie temperature of a sample with average particle diameter of 30 A was about 565°K. It proved impossible to confirm the large variations of Curie temperature, strongly dependent on particle size reported recently for similar preparations.Keywords
This publication has 8 references indexed in Scilit:
- Zur Erniedrigung der Curie-Temperatur superparamagnetischer Nickel-KristalliteThe Science of Nature, 1960
- Saturation Magnetization of Nickel Films of Thickness Less Than 100 APhysical Review B, 1959
- SuperparamagnetismJournal of Applied Physics, 1959
- Relations entre la dimension des grains et les propriétés magnétiques des amalgames du fer et du cobaltJournal de Physique et le Radium, 1959
- The anisotropy of very small cobalt particlesJournal de Physique et le Radium, 1959
- Temperaturabhängigkeit der spontanen Magnetisierung in kleinen ferromagnetischen TeilchenThe European Physical Journal A, 1958
- Temperaturunabhängige spontane Magnetisierung von Kohärenzbereichen des Kobalts im Wirtsgitter des KupfersThe Science of Nature, 1958
- Structure and properties of compounds formed during the preparation of nickel‐on‐silica catalystsRecueil des Travaux Chimiques des Pays-Bas, 1951