Magnetic and transport properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrFeO</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>

Williams, G. V. M.; Hemery, E. K.; McCann, Duncan

doi:10.1103/physrevb.79.024412

Cited by 29 publications

(26 citation statements)

References 30 publications

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“…The EB was found in polycrystalline, Pr 1−x Sr x Fe 0.8 Ni 0.2 O 3−δ with x = 0.1, 0.2 and 0.3 where a frustrated magnetic order ascribed to competing FM and AFM interactions were proposed to be correlated with the EB effect [192]. A significantly large EB effect (H E ≈ 1.44 kOe at 10 K) has been reported in oxygen deficient, SrFeO 2.75 which was suggested to be involved with Fe(2) moment Néel temperature (∼ 230 K), below which the EB appeared due to FC process [193].…”

Section: Other Oxides With Perovskite Structurementioning

confidence: 99%

Exchange bias effect in alloys and compounds

Giri

Patra

Majumdar

2011

J. Phys.: Condens. Matter

321

225

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Abstract. The phenomenology of exchange bias effects observed in structurally single-phase alloys and compounds but composed of a variety of coexisting magnetic phases such as ferromagnetic, antiferromagnetic, ferrimagnetic, spin-glass, clusterglass, disordered magnetic states are reviewed. The investigations on exchange bias effects are discussed in diverse types of alloys and compounds where qualitative and quantitative aspects of magnetism are focused based on macroscopic experimental tools such as magnetization and magnetoresistance measurements. Here, we focus on improvement of fundamental issues of the exchange bias effects rather than on their technological importance.

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Section: Other Oxides With Perovskite Structurementioning

confidence: 99%

Exchange bias effect in alloys and compounds

Giri

Patra

Majumdar

2011

J. Phys.: Condens. Matter

321

225

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“…We here focus on oxygen-deficient Fe-based perovskite oxides, SrFeO x (SFO x ), which exhibit a variety of structural and physical properties depending on their oxygen vacancy concentration1114151617181920212223. The general formula of the known phases is described as SrFeO 3–1/ n with n = ∞, 8, 4, 2 and 1.…”

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confidence: 99%

Strain-induced significant increase in metal-insulator transition temperature in oxygen-deficient Fe oxide epitaxial thin films

Hirai

Kan

Ichikawa

et al. 2015

Sci Rep

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Oxygen coordination of transition metals is a key for functional properties of transition-metal oxides, because hybridization of transition-metal d and oxygen p orbitals determines correlations between charges, spins and lattices. Strain often modifies the oxygen coordination environment and affects such correlations in the oxides, resulting in the emergence of unusual properties and, in some cases, fascinating behaviors. While these strain effects have been studied in many of the fully-oxygenated oxides, such as ABO3 perovskites, those in oxygen-deficient oxides consisting of various oxygen coordination environments like tetrahedra and pyramids as well as octahedra remain unexplored. Here we report on the discovery of a strain-induced significant increase, by 550 K, in the metal-insulator transition temperature of an oxygen-deficient Fe oxide epitaxial thin film. The observed transition at 620 K is ascribed to charge disproportionation of Fe3.66+ into Fe4+ and Fe3+, associated with oxygen-vacancy ordering. The significant increase in the metal-insulator transition temperature, from 70 K in the bulk material, demonstrates that epitaxial growth of oxygen-deficient oxides under substrate-induced strain is a promising route for exploring novel functionality.

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“…20 The origin of the observed EB in orthorhombic SrFeO 2.75 is yet unclear and partially due to Fe 3+ site than Fe 4+ site. 16 In spin glass systems exchange coupling between the FM and AFM interface gives rise to unidirectional anisotropy leading to exchange bias field. Thus, Ti doping is expected to affect the EB present in the system.…”

Section: Resultsmentioning

confidence: 99%

“…The exchange bias effect is observed in many systems such as magnetic multilayers, core shell nanoparticles, spin glasses and mixed valent materials etc. [9][10][11][12][13][14] Exchange bias is reported in undoped SrFeO 3-δ in 15,16 and this paper reports the exchange bias in SrFe 1-x Ti x O 3-δ (x = 0 to 0.3).…”

Section: Introductionmentioning

confidence: 99%

Exchange bias effect in Ti doped nanocrystalline SrFeO3-δ

Kumar

Srinath

2014

AIP Advances

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Materials of Ti doped nanocrystalline SrFeO3-δ were synthesized through solid state reaction. Detailed magnetization measurements were carried out in zero field cooled (ZFC) and field cooled (FC) conditions. Compounds of SrFe1-xTixO3-δ (x = 0.1 to 0.3) are found to be spin glass and parent compound is a helical antiferromagnet. Non magnetic Ti4+ reduces the strength of exchange interactions and the curvature of hysteresis is changed towards concave nature. Exchange bias is observed below the peak temperature (irreversibility in magnetization (TIrr)) in ZFC-FC of SrFe1-xTixO3-δ (x = 0 to 0.3). The coercivity and exchange bias field values are found to be decreases with increase in temperature. Observed exchange bias effect is attributed to competition between antiferromagnetic superexchange and ferromagnetic double exchange interactions.

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Magnetic and transport properties ofSrFeOx

Cited by 29 publications

References 30 publications

Exchange bias effect in alloys and compounds

Exchange bias effect in alloys and compounds

Strain-induced significant increase in metal-insulator transition temperature in oxygen-deficient Fe oxide epitaxial thin films

Exchange bias effect in Ti doped nanocrystalline SrFeO3-δ

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