Room temperature ferromagnetism is observed in chemically synthesized powder samples of Sn1?xCox O2 with x = 0.005 and 0.01. Magnetic hysteresis loops are ovserved at 300K with coercivity Hc ~ 630 Oe, saturation magnetization Ms ~0.133µ? and about 31% remenance. Analyses of the magnetization data of paramagnetic samples with x = 0.01 and 0.03, measured as a function of temperature (3-330K) and magnetic field (up to 50kOe), indicated the presence of Co²? ions with spin S = 3/2. Magnetic data obtained from samples prepared at different temperatures indicate that the observed ferromagnetism for x = 0.01 might have been triggered by changes in the oxygen stiochiometry.
Revised: April 7, 2011 |
Published: August 30, 2004
Citation
Punnoose A., J.S. Hays, V. Gopal, and V. Shutthanandan. 2004.Room-Temperature Ferromagnetism in Chemically Synthesized Sn1-xCox O2 Powders.Applied Physics Letters 85, no. 9:1559-1561.PNNL-SA-42567.