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We present the first circularly polarized harmonics in the soft X-ray region and the physics underlying it. This source enables the first X-ray magnetic circular dichroism measurements in rare earth elements on tabletop.
We fabricate and characterize a luminescent hyperbolic metamaterial consisting of InGaAsP/Ag multilayers. For the first time, one of the metamaterial constituents is a gain media. The hyperbolic dispersion is confirmed through the anisotropic photoluminescence, with emission strongly dependent on pump polarization.
The interplay of light and magnetism has been a topic of interest since the original observations of Faraday and Kerr where magnetic materials affect the light polarization. While these effects have historically been exploited to use light as a probe of magnetic materials there is increasing research on using polarized light to alter or manipulate magnetism. For instance deterministic magnetic switching...
Electric field effect (EFE) in ferromagnetic/oxide dielectric structures provides a new route to control domain wall (DW) dynamics with low power dissipation. However, EFE on DW velocity has been only observed so far in the creep regime where DW velocity is low due to a strong interaction with pinning sites. Our approach makes use of CoFeB-MgO films with perpendicular magnetic anisotropy (PMA), which...
Recently, the manipulation of domain walls using magnetic field [1] spin polarized current [2] electric field [3] and temperature gradient [4] have attracted significant interest. This control of domain wall nucleation and propagation could lead to new advances in the field of data storage [5] and magnetic logic [6]. Here we report on the use of a thermal gradient to nucleate, propagate and annihilate...
The extent to which dipolar interactions affect switching field distributions and thermal stability, and subsequently system performance, depends closely on the areal density, materials properties, and the architecture of the media, as well as the recording scheme and field profiles. This paper assesses, via micromagnetic simulations, the potential of heterogeneous capped bit patterned media and other...
This paper discusses spin-transfer devices that have perpendicularly magnetized free and polarizing layers that offers the potential for reduced critical currents while still maintaining a high energy barrier U towards thermally induced magnetization reversal. A macrospin model predicts a zero-temperature switching current U for perpendicularly magnetized devices. For in-plane devices the current...
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