Synthesis and characterization of Co3O4 nanorods by thermal decomposition of cobalt oxalate

Anchored cobalt film as stable supported catalyst for hydrolysis of sodium borohydride for chemical hydrogen storage

We provide an overview of key fundamental aspects of a vastly growing field of research involving ferrimagnetic heterostructures, with special focus on their functionality in magnetic recording. We firstly describe various important achievements involving the transition to perpendicular magnetic recording and the concomitant increase of the areal density of magnetic bits, and analyze their future progress. This comprises emergent technologies such as heat-assisted magnetic recording, bit-patterned media as well as novel ways of controlling the magnetization through spin-transfer torques, spin Hall and Rashba-Edelstein effects, including their extension to the case of topological states of matter. Next, we highlight the discovery of all-optical switching in ferrimagnets, which offers unique possibilities for increasing the writing speeds via light-matter interaction. This effect has led to a tremendous interest in incorporating ferrimagnetic materials in magnetic memory devices. For this purpose, tunability of intrinsic magnetic properties of ferrimagnetic alloys is critically important. By highlighting exemplary investigations, we demonstrate the unique properties of ferrimagnets, such as magnetic compensation, spin reorientation, or noncollinear magnetic states, which allow for enhanced tunability of functional spintronic devices. In this respect, the miniaturization required to achieve ultrahigh areal bit densities leads to new fundamental challenges in both growth of magnetic nanostructures and control of magnetic properties of ferrimagnets in low dimensions. To this end, we discuss new functionalities of ferrimagnetic nanostructures that pave the way for their incorporation into established concepts of magnetic recording.

Ferrimagnetic Heterostructures for Applications in Magnetic Recording

Cobalt nanowires were obtained in the process of electrodeposition into pores of an alumina membrane. Structural research (XRD, TEM) of Co revealed the face-centered cubic structure. However, the existence of the hexagonal structure cannot be excluded due to strong texture. The influences of an external magnetic field and Al2O3 membrane geometry on magnetic properties of obtained wires were examined. It was found that cobalt nanowires exhibit pronounced shape anisotropy in a direction parallel to the wire axis. The highest influence on the magnetic properties is ascribed to the nanowires geometry i.e., height, diameter, and distances between single wires. Application of an external magnetic field in a perpendicular direction to the sample surface during cobalt electrodeposition increases magnetic anisotropy with a privileged direction along the wire axis. Application of the magnetic field in a parallel direction to the sample surface changes the direction of magnetization.

https://link.springer.com/content/pdf/10.1007%2Fs10008-014-2552-6.pdf

Structure and magnetic properties of Co nanowires electrodeposited into the pores of anodic alumina membranes

Magnetic field annealing dependent magnetic properties of Co90Pt10 nanowire arrays

Magnetoelectrolysis of Co nanowire arrays grown in a track-etched polycarbonate membrane

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Magnetoelectrolysis of Co nanowire arrays grown in a track-etched polycarbonate membrane