Magnetic Recording of Superconducting States

Abstract

Local polarization of magnetic materials has become a well-known and widely used method for storing binary information. Numerous applications in our daily life such as credit cards, computer hard drives, and the popular magnetic drawing board toy, rely on this principle. In this work, we review the recent advances on the magnetic recording of inhomogeneous magnetic landscapes produced by superconducting films. We summarize the current compelling experimental evidence showing that magnetic recording can be applied for imprinting in a soft magnetic layer the flux trajectory taking place in a superconducting layer at cryogenic temperatures. This approach enables the ex situ observation at room temperature of the imprinted magnetic flux landscape obtained below the critical temperature of the superconducting state. The undeniable appeal of the proposed technique lies in its simplicity and the potential to improve the spatial resolution, possibly down to the scale of a few vortices.

Vortex jets generated by edge defects in current-carrying superconductor thin strips

“…II B and II D we have analyzed the shape of vortex jets in narrow and wide strips and phenomena that arise due to the difference between the vortex jet and the vortex chain. It should be noted that the case of a superconducting strip in the Meissner state under consideration is different from the often studied case of vortex penetration into a strip that is in the critical state, where vortex avalanches (dendrites) are observed [62][63][64][65][66][67][68][69]. The considered regime is also different from the case of strips with rather strong intrinsic pinning at low magnetic fields, where the flux does not penetrate with a smooth advancing front, but instead as a series of irregularly shaped protrusions, resulting in v * 0 at B 0 [70].…”

Writing 3D Nanomagnets Using Focused Electron Beams

“…Examples are odd-frequency spin-triplet superconductivity [ 102 ] favoring non-collinear magnetization environments [ 103 ] and leading to long-range proximity [ 104 , 105 ], giant thermoelectric [ 106 ] and thermo-spin [ 107 ] effects. In addition, S/F heterostructures find applications in magnetic recording [ 108 ], information storage devices [ 109 ], and magnetic cloaking metamaterials [ 110 ]. Inhomogeneous magnetization configurations induced by the geometry or topology of 3D FEBID structures should thus be pivotal for engineering new states of matter in which the low-dissipative response of S is combined with the magnetic order of F, opening new horizons for quantum computing.…”

Soft Superconductors: Materials and Applications

“…In Type 2 compounds, under standard pressure, the highest critical temperature value is -138 °C (HgBa2Ca2Cu3O8). Another difference of Type 2 superconductors from Type 1 is that they are affected when exposed to a magnetic field [14,15]. In 1911, Heike Kamerlingh Onnes determined that when liquid helium was heated to -269ºC, the electrical resistance of the material was disappeared.…”