Double perovskites with ferromagnetism above room temperature

作者: D Serrate , J M De Teresa , M R Ibarra

DOI: 10.1088/0953-8984/19/2/023201

关键词: Tunnel junctionExchange interactionCondensed matter physicsSpin polarizationCoercivityIonic radiusMagnetoresistanceChemistryFerromagnetismFermi level

摘要: We review the structural, magnetic and transport properties of double perovskites (A2BB'O6) with ferromagnetism above room temperature. Ferromagnetism in these compounds is explained by an indirect B?O?B'?O?B exchange interaction mediated itinerant electrons. first focus on BB' =?FeMo-based perovskites, Sr2FeMoO6 (TC = 420?K) being most studied compound. These show metallic behaviour low coercivity. Afterwards, we will B' Re compounds, where significant orbital moment plays a crucial role properties, for example large coercivity magnetostructural coupling. More specifically, discuss A2FeReO6 series, maximum TC 520?K Ca2FeReO6, which shows tendency to semiconducting behaviour. Finally, describe Sr2(Fe1?xCrx)ReO6 625?K Sr2CrReO6, highest oxide compound without Fe. This metallic. impact materials spin electronics light their high polarization at Fermi level metallicity. In particular, intergrain magnetoresistance effect observed polycrystalline samples possible implementation as electrodes tunnel junctions.

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