Room-temperature ferromagnetism in chemically synthesized Sn1-xCoxO2 powders

Punnoose, A.; Hays, J.; Gopal, V.; Shutthanandan, V.
August 2004
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1559
Academic Journal
Room-temperature ferromagnetism is observed in chemically synthesized powder samples of Sn1-xCoxO2 with x=0.005 and 0.01. Magnetic hysteresis loops are observed at 300 K with coercivity Hc∼630 Oe, saturation magnetization Ms∼0.133μB/Co ion, and about 31% remanence. Analyses of the magnetization data of paramagnetic samples with x=0.01 and 0.03, measured as a function of temperature (3–330 K) and magnetic field (up to 65 kOe), indicate the presence of Co+2 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 stoichiometry.


Related Articles

  • Field-Induced Magnetic Order in Frustrated TbBaCo4O7 Single Crystals. Szymczak, R.; Bludov, A.N.; Gnatchenko, S.L.; Barilo, S.N.; Jezierski, A.; Szymczak, H. // Acta Physica Polonica, A.;Aug2010, Vol. 118 Issue 2, p299 

    We present results of dc magnetic susceptibility measurements in TbBaCo4O7 single crystals performed at temperatures in the range 2-300 K and in magnetic fields up to 55 kOe. The results obtained seem to suggest that the ground state of TbBaCo4O7 is composed of coexisting long-range ordered and...

  • Local spin-density waves in Cr–V alloys: Dependence on temperature and applied magnetic field. de Oliveira, L. M.; Ortiz, W. A.; de Oliveira, A. J. A. // Journal of Applied Physics;5/15/2003, Vol. 93 Issue 10, p7154 

    The appearance of Curie-Weiss behavior in itinerant antiferromagnetic systems is an important subject of research in the case of Cr alloys. The nature of the phenomenon is associated to stabilization of a short-range order, which allows formation of local spin-density waves below a certain...

  • Temperature study of the spin-transfer switching speed from dc to 100 ps. Devolder, T.; Tulapurkar, A.; Suzuki, Y.; Chappert, C.; Crozat, P.; Yagami, K. // Journal of Applied Physics;9/1/2005, Vol. 98 Issue 5, p053904 

    We study the speed of the magnetization switching resulting from spin transfer in pillar-shaped CoFe/Cu/CoFe spin valves and the temperature dependence thereof. The switching speed was investigated with current pulses of durations from 100 ps to dc while the temperature was varied from 50 to 300...

  • Electrical resistivity of the Ti4 O7 Magneli phase under high pressure. Acha, C.; Monteverde, M.; Núñez-Regueiro, M.; Kuhn, A.; Alario Franco, M. A. // European Physical Journal B -- Condensed Matter;Aug2003, Vol. 34 Issue 4, p421 

    We have measured resistivity as a function of temperature and pressure of Ti4O7 twinned crystals using different contact configurations. Pressures over 4 kbar depress the localization of bipolarons and allow the study of the electrical conduction of the bipolaronic phase down to low...

  • Record Seebeck coefficient and extremely low thermal conductivity in nanostructured SnSe. Serrano-Sánchez, F.; Gharsallah, M.; Nemes, N. M.; Mompean, F. J.; Martínez, J. L.; Alonso, J. A. // Applied Physics Letters;2015, Vol. 106 Issue 9, p1 

    SnSe has been prepared by arc-melting, as mechanically robust pellets, consisting of highly oriented polycrystals. This material has been characterized by neutron powder diffraction (NPD), scanning electron microscopy, and transport measurements. A microscopic analysis from NPD data demonstrates...

  • Magnetically Controlled Shape Memory Behaviour—Materials and Applications. Gandy, A. P.; Sheikh, A.; Neumann, K.; Neumann, K.-U.; Pooley, D.; Ziebeck, K. R. A. // AIP Conference Proceedings;6/19/2008, Vol. 1021 Issue 1, p82 

    For most metals a microscopic change in shape occurs above the elastic limit by the irreversible creation and movement of dislocations. However a large number of metallic systems undergo structural, martensitic, phase transformations which are diffusionless, displacive first order transitions...

  • Strong magnetocaloric effects in La1-zCez(Fex-yMnySi1-x)13 at low temperatures. Fujieda, S.; Fujita, A.; Kawamoto, N.; Fukamichi, K. // Applied Physics Letters;8/7/2006, Vol. 89 Issue 6, p062504 

    The Curie temperature TC of La1-zCez(Fex-yMnySi1-x)13 is decreased by adjusting the composition, and hence the itinerant-electron metamagnetic transition is observed at 5 K in La0.75Ce0.25(Fe0.850Mn0.035Si0.110)13 after zero-field cooling. As a result, the La1-zCez(FexMnySi1-x)13 compounds...

  • The Superconducting and Magnetic States in RuSr2GdCu2O8, Based on the Magnetic, Transport and Magneto-Caloric Characteristics. Klamut, P. W.; Plackowski, T. // Acta Physica Polonica, A.;Aug2010, Vol. 118 Issue 2, p254 

    The article discusses selected properties of the non- and superconducting polycrystalline samples of RuSr2GdCu2O8 and comments on the consequences of introducing insignificant sub-stoichiometry of Ru into the nominal formula. The magneto-resistive and the magnetic characteristics are interpreted...

  • Observation of the “Inverse” spin valve effect in a Ni/V/Ni trilayer system. Leksin, P. V.; Salikhov, R. I.; Garifullin, I. A.; Vinzelberg, H.; Kataev, V.; Klingeler, R.; Tagirov, L. R.; Büchner, B. // JETP Letters;Sep2009, Vol. 90 Issue 1, p59 

    An experimental study of magnetic and superconducting properties of a trilayer Ni/V/Ni thin film system grown on single-crystalline MgO(001) substrate is reported. The field dependence of the superconducting transition temperature T c for samples comprising Ni layers with similar values of the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics