Coercivity in exchange-bias bilayers

Stiles, Mark D.; McMichael, Robert D.

doi:10.1103/physrevb.63.064405

Cited by 216 publications

(144 citation statements)

References 44 publications

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“…It is clearly associated with the exchange-coupled NiFe/IrMn interface. The two leading anisotropies commonly used to characterize FM/AFM interfaces are the exchange bias field and the rotational anisotropy, the latter being the origin of the increased coercivity [35,36]. Rotational anisotropy can be modelled as an additional effective field along the magnetization direction, and thus results in an overall decrease of the resonance field in FMR measurements.…”

Section: Origins Of the Effectmentioning

confidence: 99%

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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We demonstrate that an antiferromagnet can be employed for a highly efficient electrical manipulation of a ferromagnet. In our study, we use an electrical detection technique of the ferromagnetic resonance driven by an in-plane ac current in a NiFe/IrMn bilayer. At room temperature, we observe antidampinglike spin torque acting on the NiFe ferromagnet, generated by an in-plane current driven through the IrMn antiferromagnet. A large enhancement of the torque, characterized by an effective spin-Hall angle exceeding most heavy transition metals, correlates with the presence of the exchange-bias field at the NiFe/IrMn interface. It highlights that, in addition to the strong spin-orbit coupling, the antiferromagnetic order in IrMn governs the observed phenomenon.

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Section: Origins Of the Effectmentioning

confidence: 99%

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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“…The coercivity peaks at the onset of exchange bias at an AF thickness of t NiO = 10 nm and then decreases with the occurrence of exchange bias. This dependency can be interpreted as a transformation of a 'mobile' AF spin structure into an AF 'static' domain structure with stabilization of the AF magnetization [10,32] with increasing AF thickness. Correlated to the coercivity is the dependency of H k,eff , which peaks with H c,EA and decreases with the onset of H eb,EA .…”

Section: Magnetometrymentioning

confidence: 99%

Domain wall asymmetries in Ni₈₁Fe₁₉/NiO: proof of variable anisotropies in exchange bias systems

McCord¹,

Schäfer

2009

New J. Phys.

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View the article online for updates and enhancements. Abstract. Multiple changes in the internal structure of magnetic domain walls due to alterations of the interfacial coupling across the ferromagnetic/ antiferromagnetic interface are reported for Ni 81 Fe 19 /NiO exchange coupled films. Depending on the antiferromagnetically induced anisotropy, three different types of domain walls are observed. Cross-tie domain wall structures of decreased vortex to anti-vortex spacing develop with the addition of a thin antiferromagnetic layer. For exchange biased samples strong asymmetries in domain wall structure occur for the ascending and descending branch of the magnetization loop. For the descending branch a symmetric 180 • Néel wall develops, whereas a folded cross-tie domain wall structure forms during magnetization reversal along the ascending loop branch. The novel type of 'zigzagged' cross-tie wall is characterized by cross-ties reaching differently into the surrounding domain areas. The wall alterations indicate the existence of bi-modal coupling strengths in exchange coupled systems, which is in accordance with models of exchange bias that assume pinned and unpinned spins at the ferromagnetic/antiferromagnetic interface.

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“…The FM Co layer is comprised of a number of domains for which the direction of magnetization is determined by the applied field. [16]. Their reversal takes place over a finite interval of fields because of a range of coupling strengths with different antiferromagnetic CoO domains [17].…”

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confidence: 99%

Ferromagnetic domain distribution in thin films during magnetization reversal

et al. 2002

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We have shown that polarized neutron reflectometry can determine in a model-free way not only the mean magnetization of a ferromagnetic thin film at any point of a hysteresis cycle, but also the mean square dispersion of the magnetization vectors of its lateral domains. This technique is applied to elucidate the mechanism of the magnetization reversal of an exchange-biased Co/CoO bilayer. The reversal process above the blocking temperature T b is governed by uniaxial domain switching, while below T b the reversal of magnetization for the trained sample takes place with substantial domain rotation.

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Coercivity in exchange-bias bilayers

Cited by 216 publications

References 44 publications

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Domain wall asymmetries in Ni₈₁Fe₁₉/NiO: proof of variable anisotropies in exchange bias systems

Ferromagnetic domain distribution in thin films during magnetization reversal

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Coercivity in exchange-bias bilayers

Cited by 216 publications

References 44 publications

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Domain wall asymmetries in Ni81Fe19/NiO: proof of variable anisotropies in exchange bias systems

Ferromagnetic domain distribution in thin films during magnetization reversal

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Domain wall asymmetries in Ni₈₁Fe₁₉/NiO: proof of variable anisotropies in exchange bias systems