Dynamic magnetic anisotropy at the onset of exchange bias: The<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Ir</mml:mi><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow></mml:math>ferromagnet/antiferromagnet system

McCord, Jeffrey; Mattheis, R.; Elefant, D.

doi:10.1103/physrevb.70.094420

Cited by 111 publications

(75 citation statements)

References 44 publications

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“…The rotational anisotropy and coercivity are the largest for the sample with 3-nm IrMn. Similar thickness dependence has been observed experimentally using different techniques [37,38]. One can see a correlation between the size of the exchange bias and h z by comparing Figs.…”

Section: Origins Of the Effectsupporting

confidence: 60%

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 Effectsupporting

confidence: 60%

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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“…The experimental manifestation of these thermal effects is the rotatable anisotropy exhibited by exchange bias systems, which has been recently explained theoretically by Stamps et al 12 and measured by McCord et al 13 . While exchange bias in thin film systems with in-plane magnetization has been explored extensively, the study of exchange bias in systems with perpendicular anisotropy is more recent 14,15,16,17,18,19,20,21,22,23,24,25 .…”

Section: Introductionmentioning

confidence: 82%

“…They also claim that this asymmetry is the evidence of remagnetization effects in the AF layer and in particular the formation of a F-AF "exchangespring" during magnetization reversal. A recent paper by Mc Cord et al also attributes the asymmetry in the hysteresis loop to different degrees of disorder induced in the AF layer by ascending and descending fields 13 . Magnetization reversal in perpendicular exchange biased systems has been much less investigated.…”

Section: Introductionmentioning

confidence: 99%

Magnetic relaxation of exchange biasedPt∕Comultilayers studied by time-resolved Kerr microscopy

et al. 2005

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Magnetization relaxation of exchange biased (Pt/Co)5/Pt/IrMn multilayers with perpendicular anisotropy was investigated by time-resolved Kerr microscopy. Magnetization reversal occurs by nucleation and domain wall propagation for both descending and ascending applied fields, but a much larger nucleation density is observed for the descending branch, where the field is applied antiparallel to the exchange bias field direction. These results can be explained by taking into account the presence of local inhomogeneities of the exchange bias field.

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“…It was found in experiment that while the uniaxial anisotropy dominates the system in thicker AFM regime as expected, the rotatable anisotropy dominates the system in thinner AFM regime [9,10]. The idea of rotatable anisotropy has been further tested indirectly by studies of the time-dependent dynamics [11,12], temperature dependence of magnetization reversal [13], and the magnetic training effect [14], etc. However, a microscopic origin of the rotatable anisotropy has never been clearly identified.…”

mentioning

confidence: 99%

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

Park

Arenholz

et al. 2010

Applied Physics Letters

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CoO/Fe thin films were grown epitaxially onto vicinal Ag(001) and investigated using Magneto-Optic Kerr Effect, X-ray Magnetic Circular Dichroism (XMCD), and X-ray Magnetic Linear Dichroism (XMLD) techniques. We show that the CoO film in the ultrathin regime does not induce a uniaxial magnetic anisotropy but a coercivity enhancement. This result provides a mechanism for the microscopic origin of the rotatable magnetic anisotropy. XMLD measurement further reveals that the underlying mechanism is that the CoO spins are totally rotatable in the ultrathin regime to follow the Fe magnetization.

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Dynamic magnetic anisotropy at the onset of exchange bias: TheNiFe∕IrMnferromagnet/antiferromagnet system

Cited by 111 publications

References 44 publications

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Magnetic relaxation of exchange biasedPt∕Comultilayers studied by time-resolved Kerr microscopy

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

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