Anomalous exchange bias at collinear/noncollinear spin interface

Tian, Yuan; Ding, Junfeng; Lin, Wenzhi; Chen, Z. H.; David, Adrian; He, Miao; Hu, Wei; Chen, Lang; Wu, Tom

doi:10.1038/srep01094

Cited by 44 publications

(40 citation statements)

References 68 publications

(100 reference statements)

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“…Because of its high room-temperature mobility compared with TiO 2 , mesoporous BSO (m-BSO) has recently been employed in PSCs, resulting in a PCE of 12.3%. In general, transition-metal oxides have rich physical properties, [179][180][181][182] and they show promise for use in PV applications. Similar to STO and ZSO, BSO also results in better morphology and coverage of the perovskite layer.…”

Section: Ternary Metal Oxidesmentioning

confidence: 99%

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Haque

Sheikh

Guan

et al. 2017

Advanced Energy Materials

154

116

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Over the past few years, hybrid halide perovskites have emerged as a highly promising class of materials for photovoltaic technology, and the power conversion efficiency of perovskite solar cells (PSCs) has accelerated at an unprecedented pace, reaching a record value of over 22%. In the context of PSC research, wide‐bandgap semiconducting metal oxides have been extensively studied because of their exceptional performance for injection and extraction of photo‐generated carriers. In this comprehensive review, we focus on the synthesis and applications of metal oxides as electron and hole transporters in efficient PSCs with both mesoporous and planar architectures. Metal oxides and their doped variants with proper energy band alignment with halide perovskites, in the form of nanostructured layers and compact thin films, can not only assist with charge transport but also improve the stability of PSCs under ambient conditions. Strategies for the implementation of metal oxides with tailored compositions and structures, and for the engineering of their interfaces with perovskites will be critical for the future development and commercialization of PSCs.

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Section: Ternary Metal Oxidesmentioning

confidence: 99%

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Haque

Sheikh

Guan

et al. 2017

Advanced Energy Materials

154

116

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“…1(b) taken both before and after the growth exhibit atomically smooth surfaces with clear unit-cell-height steps. The film growth is monitored by in situ highpressure reflection high-energy electron diffraction (RHEED) as previously reported [38,39], and the intensity oscillations [ Fig. 1(c)] indicate a layer-by-layer growth mode.…”

Section: Sample Fabricationmentioning

confidence: 99%

Nonvolatile Resistive Switching inPt/LaAlO3/SrTiO3Heterostructures

Luo

Turner

et al. 2013

Phys. Rev. X

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Resistive switching heterojunctions, which are promising for nonvolatile memory applications, usually share a capacitorlike metal-oxide-metal configuration. Here, we report on the nonvolatile resistive switching in Pt=LaAlO 3 =SrTiO 3 heterostructures, where the conducting layer near the LaAlO 3 =SrTiO 3 interface serves as the ''unconventional'' bottom electrode although both oxides are band insulators. Interestingly, the switching between low-resistance and high-resistance states is accompanied by reversible transitions between tunneling and Ohmic characteristics in the current transport perpendicular to the planes of the heterojunctions. We propose that the observed resistive switching is likely caused by the electric-field-induced drift of charged oxygen vacancies across the LaAlO 3 =SrTiO 3 interface and the creation of defect-induced gap states within the ultrathin LaAlO 3 layer. These metal-oxide-oxide heterojunctions with atomically smooth interfaces and defect-controlled transport provide a platform for the development of nonvolatile oxide nanoelectronics that integrate logic and memory devices.

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“…Overall the progress in EB has been two-fold. First, the EB has been addressed in unconventional heterostructures/bilayers with FM-PM, AFM-PM and collinear-noncollinear magnetic heterostructures7121316. This has challenged our present understanding of EB which is generally observed in conventional FM-AFM heterostructures1415.…”

mentioning

confidence: 99%

Positive exchange-bias and giant vertical hysteretic shift in La0.3Sr0.7FeO3/SrRuO3 bilayers

Rana

Pandey

Singh

et al. 2014

Sci Rep

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The exchange-bias effects in the mosaic epitaxial bilayers of the itinerant ferromagnet (FM) SrRuO3 and the antiferromagnetic (AFM) charge-ordered La0.3Sr0.7FeO3 were investigated. An uncharacteristic low-field positive exchange bias, a cooling-field driven reversal of positive to negative exchange-bias and a layer thickness optimised unusual vertical magnetization shift were all novel facets of exchange bias realized for the first time in magnetic oxides. The successive magnetic training induces a transition from positive to negative exchange bias regime with changes in domain configurations. These observations are well corroborated by the hysteretic loop asymmetries which display the modifications in the AFM spin correlations. These exotic features emphasize the key role of i) mosaic disorder induced subtle interplay of competing AFM-superexchange and FM double exchange at the exchange biased interface and, ii) training induced irrecoverable alterations in the AFM spin structure.

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Anomalous exchange bias at collinear/noncollinear spin interface

Cited by 44 publications

References 68 publications

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Nonvolatile Resistive Switching inPt/LaAlO3/SrTiO3Heterostructures

Positive exchange-bias and giant vertical hysteretic shift in La0.3Sr0.7FeO3/SrRuO3 bilayers

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