(1) Laboratoire de Magnétisme Louis Néel, B.P. 166, F-38042 Grenoble Cedex 9, France, FR;(2) Institut für Physikalische Chemie und Elektrochemie, Callinstr. 3-3a, D-30167 Hannover, Germany, DE
Abstract:
Magnetic properties of isolated DyN clusters are studied in a molecular beam performing Stern-Gerlach experiments. The magnetizations μz of DyN are measured in dependence of the magnetic field strength B = 0-1.6 T and at nozzle temperatures Tn = 18 K and Tn = 300 K. At room temperature the magnetization augments linear with the field following a simple paramagnetic model. At Tn = 18 K the magnetization curves saturate at field strengths B≥0.8 T. To explain the magnetization process at low temperatures two models are discussed: A model for adiabatic magnetization based on cluster rotation effects and a modified van-Vleck model. Received 30 November 2000