Layer resolved magnetic domain imaging of epitaxial heterostructures in large applied magnetic fields

Zohar, S.; Choi, Y.; Love, DM; Mansell, Rhodri; Barnes, C. H. W.; Keavney, D. J.; Rosenberg, R. A.

doi:10.1063/1.4913359

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…The introduction of the second energy scale, that of the RKKY coupling, leads to the changes in the domain pattern [11], [20]. The extracted interlayer coupling is given in figure 4(a).…”

Section: Magnetic Measurements and Discussionmentioning

confidence: 99%

“…The two notable changes in the domain pattern with the onset of the RKKY coupling (see figure 3) are the formation of a well-defined front and the significant reduction in the amplitude of the domains. This is driven by the energy gradient associated with the spatially varying RKKY coupling [20]. Greater energy is required for the wall to deviate further up the wedge leading to small amplitude zigzag domains on a well-defined line.…”

Section: Magnetic Measurements and Discussionmentioning

confidence: 99%

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Zigzag Domain Wall Mediated Reversal in Antiferromagnetically Coupled Layers

et al. 2017

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The Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between two magnetic layers leads to many important technological applications. Here, the interaction between changing antiferromagnetic RKKY coupling and domain structure is studied in a sample consisting of two 5 nm thick CoFeB layers separated by a wedge of Cu up to 4 nm thick. Magnetic reversal occurs via the propagation of a zigzag domain wall front along the wedge. The modification of domain patterns created in the reversal of a coupled layers in the presence of antiferromagnetic RKKY coupling and coupling gradients is demonstrated. Firstly, the coupling leads to a smaller amplitude of the zigzag wall, which is aligned perpendicular to the easy axis, followed by elongation of the walls at higher coupling strength. The antiferromagnetic RKKY coupling, while not strong enough to cause antiparallel alignment of the layers, is argued to lead to coupling between the spins in the domain walls in the two layers, lowering their energy and driving the reversal behavior of the film.

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“…The introduction of the second energy scale, that of the RKKY coupling, leads to the changes in the domain pattern [11], [20]. The extracted interlayer coupling is given in figure 4(a).…”

Section: Magnetic Measurements and Discussionmentioning

confidence: 99%

Section: Magnetic Measurements and Discussionmentioning

confidence: 99%

Zigzag Domain Wall Mediated Reversal in Antiferromagnetically Coupled Layers

et al. 2017

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“…Synchrotron X-ray technology has shed light on a diverse array of fields extending from structural biology (Rasmussen et al, 2007;Appelt et al, 1981) and geology (Wenk et al, 2000) to condensed matter (Mannini et al, 2009;Bailey et al, 2013;Rosenberg et al, 2012;Zohar et al, 2015) and chemistry (Qiao et al, 2011;de Smit et al, 2008). In recent years, interest in nanoscale phenomena has motivated significant effort to focus X-ray beams well below the micrometer level (Mimura et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Rapidin situX-ray position stabilizationviaextremum seeking feedback

Zohar

Venugopalan

Kissick

et al. 2016

J Synchrotron Radiat

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X-ray beam stability is crucial for acquiring high-quality data at synchrotron beamline facilities. When the X-ray beam and defining apertures are of similar dimensions, small misalignments driven by position instabilities give rise to large intensity fluctuations. This problem is solved using extremum seeking feedback control (ESFC) for in situ vertical beam position stabilization. In this setup, the intensity spatial gradient required for ESFC is determined by phase comparison of intensity oscillations downstream from the sample with pre-existing vertical beam oscillations. This approach compensates for vertical position drift from all sources with position recovery times <6 s and intensity stability through a 5 mm aperture measured at 1.5% FWHM over a period of 8 hours.

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Vector magnetometry of Fe/Cr/Fe trilayers with biquadratic coupling

Mansell¹,

Petit²,

Fernández-Pacheco³

et al. 2017

J. Phys. D: Appl. Phys.

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The magnetic reversal of epitaxial Fe / Cr / Fe trilayer samples grown on GaAs is studied. In wedged samples both long and short period coupling oscillations associated with Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling in Cr are seen in the easy axis saturation fields. By using vector vibrating sample magnetometry and both longitudinal and transverse magneto-optical Kerr effect magnetometry we are able to determine the exact reversal path of both the magnetic layers. Changes in the reversal behavior are seen with sub-monolayer changes of the thickness of the Cr interlayer. The two main reversal paths are described in terms of whether the reversal is dominated by bilinear RKKY coupling, which leads to an antiparallel state at remanence or by biquadratic coupling which leads to a 90 degree alignment of layers at remanence. The changing reversal behaviour is discussed with respect to the possibility of using such systems for multilayer memory applications and, in particular, the limits on the required accuracy of the sample growth.

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Layer resolved magnetic domain imaging of epitaxial heterostructures in large applied magnetic fields

Cited by 3 publications

References 16 publications

Zigzag Domain Wall Mediated Reversal in Antiferromagnetically Coupled Layers

Zigzag Domain Wall Mediated Reversal in Antiferromagnetically Coupled Layers

Rapidin situX-ray position stabilizationviaextremum seeking feedback

Vector magnetometry of Fe/Cr/Fe trilayers with biquadratic coupling

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