Rotatable magnetic anisotropy of CoO/Fe/Ag(001) in ultrathin regime of the CoO layer

Park, J. S.; Wu, J.; Arenholz, Elke; Liberati, M.; Schöll, A.; Meng, Yuanlin; Hwang, Chanyong; Qiu, Z. Q.

doi:10.1063/1.3451464

Cited by 12 publications

(6 citation statements)

References 20 publications

(17 reference statements)

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“…The revival has been made upon placing it next to a ferromagnet [1][2][3][4], where the effects of induced coercivity (H c ) enhancement and exchange bias can be applied to the design of magnetic logic devices like the spin valve, for ''pinning'' the magnetization of a magnetic reference layer under magnetization switching of a magnetic storage layer [5]. Based on research efforts in the last few years [6][7][8][9][10][11][12], H c enhancement and exchange bias have been understood to be correlated with the so-called ''unpinned'' and uncompensated ''pinned'' moments of an antiferromagnet close to the interface, respectively.…”

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confidence: 99%

“…2(a) and 2(b), the Mn layer reveals net FM moments with its domain boundary the same as to the Fe layer. Since no FM characteristic was observed for the Mn layer alone, the presence of long range FM ordering on the Mn layer could be induced by a direct exchange coupling with the adjacent FM layer [7][8][9][10][11][12]22]. The finding of the opposite magnetic asymmetry between the Mn and Fe moments indicates a preference of antiparallel type exchange coupling [23].…”

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confidence: 99%

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How Antiferromagnetism Drives the Magnetization of a Ferromagnetic Thin Film to Align Out of Plane

et al. 2013

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Interfacial moments of an antiferromagnet are known for their prominent effects of induced coercivity enhancement and exchange bias in ferromagnetic-antiferromagnetic exchange-coupled systems. Here we report that the unpinned moments of an antiferromagnetic face-centered-cubic Mn layer can drive the magnetization of an adjacent Fe film perpendicular owing to a formation of intrinsic perpendicular anisotropy. X-ray magnetic circular dichroism and hysteresis loops show establishment of perpendicular magnetization on Fe/Mn bilayers while temperature was decreased. The fact that the magnitude of perpendicular anisotropy of the Fe layer is enhanced proportionally to the out-of-plane oriented orbital moment of the Mn unpinned layer, rather than that of Fe itself, gives evidence for the Mn unpinned moments to be the origin of the established perpendicular magnetization.

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confidence: 99%

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How Antiferromagnetism Drives the Magnetization of a Ferromagnetic Thin Film to Align Out of Plane

et al. 2013

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“…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. 14,15 Despite the above progress, it remains unclear at the microscopic level on how the AFM/FM coupling leads to the different metastable spin configurations in an AFM/FM system. We studied single crystalline CoO/Fe and NiO/Ag/CoO/Fe films grown epitaxially on a vicinal Ag͑001͒ substrate.…”

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confidence: 99%

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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“…This effect is more significant when the scale of AF domains is comparable to, or even greater than, the F domains; (3) Bulk effect of the AF on the EB can be critical due to the long correlation length along the direction perpendicular to the interface (Fig. 2 [42], where AF Co spins can be completely rotatable in ultra-thin CoO samples [43].…”

Section: Interface Structuresmentioning

confidence: 99%

Epitaxial exchange-bias systems: From fundamentals to future spin-orbitronics

Zhang

Krishnan

2016

Materials Science and Engineering: R: Reports

101

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Exchange bias has been investigated for more than half a century and several insightful reviews, published around the year 2000, have already summarized many key experimental and theoretical aspects related to this phenomenon. Since then, due to developments in thin-film fabrication and sophisticated characterization methods, exchange bias continues to show substantial advances; in particular, recent studies on epitaxial systems, which is the focus of this review, allow many long-standing mysteries of exchange bias to be unambiguously resolved. The advantage of epitaxial samples lies in the well-defined interface structures, larger coherence lengths, and competing magnetic anisotropies, which are often negligible in polycrystalline samples. Beginning with a discussion of the microscopic spin properties at the ferromagnetic/antiferromagnetic interface, we correlate the details of spin lattices with phenomenological anisotropies, and finally connect the two by introducing realistic measurement approaches and models.We conclude by providing a brief perspective on the future of exchange bias and related studies in the context of the rapidly evolving interest in antiferromagnetic spintronics.

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Rotatable magnetic anisotropy of CoO/Fe/Ag(001) in ultrathin regime of the CoO layer

Cited by 12 publications

References 20 publications

How Antiferromagnetism Drives the Magnetization of a Ferromagnetic Thin Film to Align Out of Plane

How Antiferromagnetism Drives the Magnetization of a Ferromagnetic Thin Film to Align Out of Plane

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

Epitaxial exchange-bias systems: From fundamentals to future spin-orbitronics

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