X-ray magnetic linear dichroism in absorption at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>edge of metallic Co, Fe, Cr, and V

Schwickert, M. M.; Guo, G. Y.; Tomaz, M. A.; O’Brien, W. L.; Harp, G. R.

doi:10.1103/physrevb.58.r4289

Cited by 70 publications

(42 citation statements)

References 22 publications

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“…7 X-ray magnetic circular dichroism (XMCD) experiments at the resonant Cr L 3,2 edges showed that thin Cr films exhibit a ferromagnetic polarization with a magnetization direction opposite to the Fe magnetic moments. [10][11][12][13] These results confirm theoretical predictions of a ferromagnetic state of Cr at the Fe/Cr interface and an antiparallel spin alignment, but are off as concerns the magnitude of the predicted Cr magnetic moment, 14,15 which usually is overestimated by a factor of two to three as compared to experimental findings, which settle around 0.5-0.7 μ B . Roughness at the top and bottom interface as well as interdiffusion may be invoked to explain this discrepancy.…”

Section: Introductionsupporting

confidence: 76%

Direct observation of Cr spin polarization in epitaxial Cr/Co/Cr(100) trilayers

et al. 2013

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The spin polarization of chromium at the interface next to a ferromagnetic layer is of general interest because of the competing ferromagnetic and antiferromagnetic exchange coupling. While the Fe/Cr interface has been well studied, information on the Co/Cr interface still remains scarce. Here we show for epitaxially grown Cr/Co/Cr(100) trilayers with smooth interfaces x-ray resonant magnetic scattering (XRMS) results in a saturation field of ±270 mT, recorded at the Co and Cr L 3 edges, respectively. The XRMS results at the Co edge show the expected asymmetry and a ferromagnetic hysteresis for different incident angles θ. Furthermore, XRMS measurements with the energy tuned to the Cr L 3 edge also exhibit an asymmetry, albeit much smaller than the one at the Co L 3 edge. Moreover, the magnetic hysteresis of Cr taken at the L 3 edge has a sign opposite to that of Co at the L 3 edge over a broad range of incident angles. From these results we infer first that at the Co/Cr interface chromium is ferromagnetically polarized, and second that its spin structure is oriented opposite to the magnetization of Co.

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Section: Introductionsupporting

confidence: 76%

Direct observation of Cr spin polarization in epitaxial Cr/Co/Cr(100) trilayers

et al. 2013

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“…If the magnetization reversal of the Ni layer induced a domain-wall-like rotation of the antiferromagnetically ordered Fe moments in the FeF 2 layer, the spectrum should show characteristics of FeF 2 XMLD 15 in the same ways as a Ni 2+ XMLD spectrum was observed in NiO by Scholl et al upon magnetization reversal in a Co layer exchange coupled to a NiO single crystal. 14 However, the Fe XMLD spectrum is almost identical to that obtained from ferromagnetic Fe, 16 indicating that the XMLD originates almost entirely from uncompensated Fe moments in the FeF 2 layer, following the external field and the Ni magnetization. Due to the strong anisotropy fields ͓about 15 T ͑see Ref.…”

Section: -mentioning

confidence: 88%

Magnetization reversal of uncompensated Fe moments in exchange biased Ni∕FeF2 bilayers

Arenholz

Liu

et al. 2006

Applied Physics Letters

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The magnetization reversal of uncompensated Fe moments in exchange biased Ni∕FeF2 bilayers was determined using soft x-ray magnetic circular and linear dichroism. The hysteresis loops resulting from the Fe moments are almost identical to those of the ferromagnetic Ni layer. However, a vertical loop shift indicates that some Fe moments are pinned in the antiferromagnetically ordered FeF2. The pinned moments are oriented antiparallel to small cooling fields, leading to negative exchange bias, but parallel to large cooling fields, resulting in positive exchange bias. No indication for the formation of a parallel antiferromagnetic domain wall in the FeF2 layer upon magnetization reversal in the Ni layer was found.

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“…While neutron-diffraction topography suffers from the need of long exposure times [7], XMLD has other shortcomings. It senses spin alignment via charge distribution [8,9]. The situation has been improved with the advent of nonlinear optical topography first applied for the magnetoelectric (ME) antiferromagnet Cr 2 O 3 (chromia) [10].…”

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confidence: 99%