Measuring the effects of low energy ion milling on the magnetization of Co/Pd multilayers using scanning electron microscopy with polarization analysis

We investigated the spin-wave propagation in a micro-structured yttrium iron garnet waveguide of $40$ nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of $(10.06 \pm 0.83)$ $\mu$m was observed. This leads to an estimated Gilbert damping constant of $\alpha=(8.79\pm 0.73)\times 10^{-4}$, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering spectroscopy

Section: Discussionmentioning

confidence: 99%

Spin waves in micro-structured yttrium iron garnet nanometer-thick films

Jungfleisch

Zhang

Jiang

et al. 2015

“…Ar + milling was performed on the substrates prior to the deposition of the MLs themselves. 15,16 Therefore, smoother surface and lower roughness substrates were found to be advantageous to the growth of higher coercivity Co/Pd MLs. The original purpose of Ar + milling was to remove the native silicon-oxide and relatively small particles from the substrate surface.…”

Section: A Effect Of Substrate Argon Ion Millingmentioning

confidence: 99%

Study of Co/Pd multilayers as a candidate material for next generation magnetic media

Amos

Tian

et al. 2011

Interlayer exchange coupling between [Pd/Co] multilayers and CoFeB/MgO layers with perpendicular magnetic anisotropy Appl. Phys. Lett. 101, 242403 (2012); 10.1063/1.4770300Effect of magnetostatic energy on domain structure and magnetization reversal in (Co/Pd) multilayers Microstructure and magnetic properties of a Co/Pd multilayer on a controlled Pd/Si seed layer for double-layered perpendicular magnetic recording mediaWe report a combinatorial synthesis study on the magnetic properties of sputter-deposited Co/Pd multilayers with high perpendicular anisotropy and high remnant squareness for magnetic media applications such as magnetic logic systems, bit patterned media, magneto-optical recording, and multilevel three-dimensional ͑3D͒ magnetic media. The perpendicular magnetic anisotropy in the multilayers originates from the interfacial anisotropy of the alloylike structure. The deposition conditions and subsequent microstructures of the multilayers are critical factors to determine the magnetic properties of the media. We investigated the dependence of the magnetic properties on the thickness of Co and Pd layers the number of Co/Pd bilayers. For instance, we found that a 0.26-nm-thick layer of Co would produce the highest coercivity value if paired with a 0.55-nm-thick Pd layer. Our results revealed that an Ar + milling could significantly increase the coercivity of the multilayer media. Further, we discovered that we could control the deposition pressure to achieve either granular or continuous media morphologies corresponding to exchange-coupled or decoupled grains, respectively. Finally, we used the combinatorial synthesis to tailor multilayers' properties to engineer a eight-level three-layer 3D media.

“…12 Integrating the FORC-SFD over H R results in the total magnetization that is irreversible (M Irrev ). 13 Direct imaging of magnetic domains was performed using scanning electron microscopy with polarization analysis (SEMPA), 14 with the primary focus on the out-of-plane component of the magnetization. Prior to imaging, the samples were dc demagnetized, after saturation in a 1.5 T out-of-plane magnetic field.…”

mentioning

confidence: 99%

Reversal of patterned Co/Pd multilayers with graded magnetic anisotropy

Davies

Morrow

Dennis

et al. 2011

Self Cite

Magnetization reversal and the effect of patterning have been investigated in full-film and dot arrays of Co/Pd multilayers, using the first-order reversal curve and scanning electron microscopy with polarization analysis techniques. The effect of patterning is most pronounced in low sputtering pressure films, where the size of contiguous domains is larger than the dot size. Upon patterning, each dot must have its own domain nucleation site and domain propagation is limited within the dot. In graded anisotropy samples, the magnetically soft layer facilitates the magnetization reversal, once the reverse domains have nucleated.