Structural and magnetic properties of epitaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Co</mml:mi><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math>bilayers on Ag(001)

Abrudan, R.; Miguel, J.; Bernien, Matthias; Tieg, C.; Piantek, Marten; Kirschner, J.; Kuch, W.

doi:10.1103/physrevb.77.014411

Cited by 60 publications

(59 citation statements)

References 52 publications

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“…22), respectively. We note, however, that from these data we cannot exclude the presence of an ultra-thin oxidized layer at the metal/BTO interface 23 .…”

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confidence: 77%

Interface-induced room-temperature multiferroicity in BaTiO3

et al. 2011

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Multiferroic materials possess two or more ferroic orders but have not been exploited in devices owing to the scarcity of room-temperature examples. Those that are ferromagnetic and ferroelectric have potential applications in multi-state data storage if the ferroic orders switch independently, or in electric-field controlled spintronics if the magnetoelectric coupling is strong. Future applications could also exploit toroidal moments and optical effects that arise from the simultaneous breaking of time-reversal and space-inversion symmetries. Here, we use soft X-ray resonant magnetic scattering and piezoresponse force microscopy to reveal that, at the interface with Fe or Co, ultrathin films of the archetypal ferroelectric BaTiO 3 simultaneously possess a magnetization and a polarization that are both spontaneous and hysteretic at room temperature. Ab initio calculations of realistic interface structures provide insight into the origin of the induced moments and bring support to this new approach for creating room-temperature multiferroics.

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“…22), respectively. We note, however, that from these data we cannot exclude the presence of an ultra-thin oxidized layer at the metal/BTO interface 23 .…”

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confidence: 77%

Interface-induced room-temperature multiferroicity in BaTiO3

et al. 2011

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“…9 With these advances it was identified that the NiO/Fe͑001͒ and CoO/Fe͑001͒ process a perpendicular interfacial couplings between the AFM and the FM spins above an AFM layer critical thickness 6,10 while the Fe/CoO͑001͒ processes a collinear interfacial couplings only. 11 These different behaviors in AFM/FM and FM/AFM interfacial couplings well explain the mysterious perpendicular interlayer coupling between two FM layers across an AFM spacer layer. 12,13 Recently, the identification of the AFM rotatable spins in CoO/Fe͑001͒ system 10 also reveals the mechanism of the rotatable magnetic anisotropy in the ultrathin regime of the AFM layer.…”

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confidence: 89%

Element-specific study of epitaxial NiO/Ag/CoO/Fe films grown on vicinal Ag(001) using photoemission electron microscopy

Meng

Tan

et al. 2011

Applied Physics Letters

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NiO/Ag/CoO/Fe single crystalline films are grown epitaxially on a vicinal Ag͑001͒ substrate using molecular beam epitaxy and investigated by photoemission electron microscopy. We find that after zero-field cooling, the in-plane Fe magnetization switches from parallel to perpendicular direction of the atomic steps of the vicinal surface at thinner CoO thickness but remains in its original direction parallel to the steps at thicker CoO thickness. CoO and NiO domain imaging result shows that both CoO/Fe and NiO/CoO spins are perpendicularly coupled, suggesting that the Fe magnetization switching may be associated with the rotatable-frozen spin transition of the CoO film. © 2011 American Institute of Physics. ͓doi:10.1063/1.3595274͔Magnetic interfacial interaction in antiferromagnetic/ ferromagnetic ͑AFM/FM͒ systems generates many fascinating properties such as the exchange bias effect that as a AFM/FM system is cooled down within an external magnetic field to below the Néel temperature ͑T N ͒ of the AFM layer, the FM layer hysteresis loop shifts in magnetic field.

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“…Yet, these two magnetic components are difficult to access experimentally with laboratory tools because of a virtually vanishing magnetization of AF layers and a small volume of the magnetic interface. Important progress has been made by involving neutron and Xray techniques to study the bulk part of the pinning layer and the interfacial magnetism [6][7][8][9][10][11][12][13] . For instance, in an archetypal CoO/FM bilayer, neutron scattering has revealed the origin of reduced EB.…”

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confidence: 99%

Perpendicular exchange bias in ferrimagnetic spin valves

et al. 2012

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The exchange bias effect refers to the shift of the hysteresis loop of a ferromagnet in direct contact to an antiferromagnet. For applications in spintronics a robust and tunable exchange bias is required. Here we show experimental evidence for a perpendicular exchange bias in a prototypical ferrimagnetic spin valve consisting of DyCo 5 /Ta/Fe 76 Gd 24 , where the DyCo 5 alloy has the role of a hard ferrimagnet and Fe 76 Gd 24 is a soft ferrimagnet. Taking advantage of the tunability of the exchange coupling between the ferrimagnetic layers by means of thickness variation of an interlayer spacer, we demonstrate that perpendicular unidirectional anisotropy can be induced with desirable absolute values at room temperature, without making use of a field-cooling procedure. moreover, the shift of the hysteresis loop can be reversed with relatively low magnetic fields of several hundred oersteds. This flexibility in controlling a robust perpendicular exchange bias at room temperature may be of crucial importance for applications.

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Structural and magnetic properties of epitaxialFe∕CoObilayers on Ag(001)

Cited by 60 publications

References 52 publications

Interface-induced room-temperature multiferroicity in BaTiO3

Interface-induced room-temperature multiferroicity in BaTiO3

Element-specific study of epitaxial NiO/Ag/CoO/Fe films grown on vicinal Ag(001) using photoemission electron microscopy

Perpendicular exchange bias in ferrimagnetic spin valves

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