Magnetic and Electrical Properties of Bi1−Sr MnO3: Hole-Doping Effect on Ferromagnetic Perovskite BiMnO3

Chiba, Hiroshi; Atou, Toshiyuki; Syono, Yasuhiko

doi:10.1006/jssc.1997.7432

Cited by 185 publications

(135 citation statements)

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“…This is somewhat smaller than that of bulk BMO ceramics but similar to what is reported for Bi 0.9 Sr 0.1 MnO 3 . 12 This high value of the resistivity allows us to rule out any sizeable contribution from the "bulk" conductivity of the BMO layer to the current in the tunneling experiments we present below.…”

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confidence: 88%

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confidence: 99%

“…12 It is a highly insulating compound and, remarkably, the insulating state is very robust. 12 Experimental determinations of the exchange splitting of the ͑empty͒ conduction band of BMO have not been reported; however it can be estimated to about 0.5 eV from linear spin-density approximation ͑LSDA͒ calculations 13 and to 1.6 eV from LSDA+ U. 14 In both cases, the gap is smaller for spin-up electrons, so that when used as a spin-filter barrier, a BMO layer should filter out spin-down electrons and produce a positively spin-polarized current.…”

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confidence: 99%

“…We have measured the temperature dependence of the resistivity of a 30-nm BMO film in the 150-300 K range and found a thermally activated behavior with a room-temperature resistivity of 300 K = 175 ⍀ cm ͑ 300 K =20 k⍀ cm for bulk 12 ͒ and an activation energy of E a = 239 meV ͑E a = 262 meV for bulk 12 ͒. Below 150 K, the film resistance was exceedingly large to be measured with the available experimental set up.…”

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Spin filtering through ferromagneticBiMnO3tunnel barriers

et al. 2005

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We report on experiments of spin filtering through ultrathin single-crystal layers of the insulating and ferromagnetic oxide BiMnO 3 ͑BMO͒. The spin polarization of the electrons tunneling from a gold electrode through BMO is analyzed with a counterelectrode of the half-metallic oxide La 2/3 Sr 1/3 MnO 3 ͑LSMO͒. At 3 K we find a 50% change of the tunnel resistances according to whether the magnetizations of BMO and LSMO are parallel or opposite. This effect corresponds to a spin-filtering efficiency of up to 22%. Our results thus show the potential of complex ferromagnetic insulating oxides for spin filtering and injection.

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confidence: 99%

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Spin filtering through ferromagneticBiMnO3tunnel barriers

et al. 2005

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“…The perovskite BiMnO 3 in the bulk is FM with the Curie temperature T CM = 105 K [76,77] and FE with T CE = 450-490 K [78,79]. It can be stabilized in thin-film form in a distorted perovskite structure [80].…”

Section: (D) Thin Filmsmentioning

confidence: 99%

Multi-ferroic and magnetoelectric materials and interfaces

Velev

Jaswal

Tsymbal

2011

Phil. Trans. R. Soc. A.

208

144

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The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions.

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Ferroelectricity

2017

Ferroelectrics

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Magnetic and Electrical Properties of Bi1−Sr MnO3: Hole-Doping Effect on Ferromagnetic Perovskite BiMnO3

Cited by 185 publications

References 21 publications

Spin filtering through ferromagneticBiMnO3tunnel barriers

Spin filtering through ferromagneticBiMnO3tunnel barriers

Multi-ferroic and magnetoelectric materials and interfaces

Ferroelectricity

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