Observation of field-induced domain wall propagation in magnetic nanowires by magnetic transmission x-ray microscopy

Bryan, Matthew T.; Fry, P. W.; Fischer, Peter; Allwood, D. A.

doi:10.1063/1.2832656

Cited by 11 publications

(6 citation statements)

References 22 publications

(24 reference statements)

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“…2d), where one section of the vortex is more prominent than the others. Vortex asymmetry was not observed in narrow wires [Bryan 2008], as these wires had higher shape anisotropy than the present study. The structure of the asymmetric vortex wall results in a more complicated force profile and lower field than seen above SMW or PMW.…”

Section: Trap Designscontrasting

confidence: 45%

“…Magnetic contrast was achieved at a spatial resolution of around 25 nm via X-ray magnetic circular dichroism (X-MCD) by holding the sample at an angle of 60° to the X-ray optical axis. Using opposite circular polarizations or using an image taken at saturation as a reference image [Bryan 2008], magnetic contrast was increased further by digitally dividing two raw images. Full details of the experimental arrangement of the microscope can be found elsewhere [Fischer 2006, Fischer 2008.…”

Section: Modeling and Experimental Methodsmentioning

confidence: 99%

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Switchable Cell Trapping Using Superparamagnetic Beads

et al. 2010

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Abstract-Ni81Fe19 microwires are investigated as the basis of a switchable template for positioning magnetically-labeled neural Schwann cells. Magnetic transmission X-ray microscopy and micromagnetic modeling show that magnetic domain walls can be created or removed in zigzagged structures by an applied magnetic field. Schwann cells containing superparamagnetic beads are trapped by the field emanating from the domain walls. The design allows Schwann cells to be organized on a surface to form a connected network and then released from the surface if required. As aligned Schwann cells can guide nerve regeneration, this technique is of value for developing glial-neuronal co-culture models in the future treatment of peripheral nerve injuries.

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Section: Trap Designscontrasting

confidence: 45%

Section: Modeling and Experimental Methodsmentioning

confidence: 99%

Switchable Cell Trapping Using Superparamagnetic Beads

et al. 2010

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“…In addition to modeling the spin dynamics in patterned magnetic structures, 13,14 several experimental techniques have been used in recent years which include ferromagnetic resonance force microscopy, 10,15,16 magneto-optic Kerr effect in the time domain, [17][18][19][20][21][22] vortex core dynamics, [23][24][25] Brillouin light scattering ͑BLS͒, [26][27][28][29] and x-ray microscopy. [30][31][32] However, the majority of these reports focus on determining the frequency dependencies and/or spatial mode structure, and do not address the measurement of linewidth, and more importantly, separating the intrinsic damping from other contributions to linewidth.…”

Section: Introductionmentioning

confidence: 99%

Spin dynamics and mode structure in nanomagnet arrays: Effects of size and thickness on linewidth and damping

et al. 2009

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We use frequency resolved magneto-optic Kerr effect to probe the spin dynamics and mode structure in 50-200-nm-diameter Ni 80 Fe 20 nanomagnets ranging from 3 to 10 nm in thickness. We find that the intrinsic Gilbert damping parameter is largely unaffected by the nanopatterning process despite a large linewidth dependence on the size of the nanomagnets. In the larger nanomagnets, both end and center modes are observed. The linewidth of these two modes differ considerably, which is most likely the result of the sensitivity of the end mode to small variations and imperfection of the shape and edge materials. We show that this effect can be exploited as a means to separately characterize the magnetic properties of the nanomagnets as well as the size and shape variations within the array.

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“…M-TXM was performed at beamline 6.1.2 at the Advanced Light Source in Berkeley, CA, using circularly polarised soft x-rays tuned to the Fe L3 (706 eV) X-ray absorption edge. M-TXM is capable of imaging magnetic domain walls [18], achieving in-plane magnetic contrast through X-ray magnetic circular dichroism (X-MCD) by tilting the sample by 60° with respect to the photon propagation direction. Magnetic contrast is obtained relative to a reference image, taken under a saturating magnetic field of B = -100 mT.…”

Section: Methodsmentioning

confidence: 99%