Room-Temperature Ferromagnetism in Chemically Synthesized Sn₁-xCox O₂ Powders

Journal Article · Mon Aug 30 00:00:00 EDT 2004 · Applied Physics Letters, 85(9):1559-1561

DOI:https://doi.org/10.1063/1.1786633· OSTI ID:15020901

Punnoose, Alex; Hays, Jason S; Gopal, Vidyut; Shutthanandan, V

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 ~0.133μв 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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 15020901
• Report Number(s): PNNL-SA-42567; 8206; KP1704020; TRN: US200521%%314
• Journal Information: Applied Physics Letters, 85(9):1559-1561, Vol. 85, Issue 9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TIN OXIDES
COBALT OXIDES
FERROMAGNETISM
AMBIENT TEMPERATURE
SPIN
Spintronics
PIXE
SnO2 Powders
Environmental Molecular Sciences Laboratory