Drexel

   Goran Karapetrov

Pac-man like nanomagnets could store two bits of information in a single cell

In our most recent work conducted in collaboration with our colleagues at the Institute of Electrical Engineering, Slovak Academy of Sciences, we look at the process of magnetic vortex nucleation in nanomagnets.

Magnetic vortices are characterized by polarity and chirality. We show that the vortex polarity and chirality in nanomagnets with broken rotational symmetry can be set independently by applying in-plane magnetic fields only. This is compatible with magnetic write-head media and could lead to significant increase of digital storage density since two bits of information (polarity and chirality) can be stored in a single memory element.

Read more: Pac-man like nanomagnets could store two bits of information in a single cell

Multimetallic Au/FePt nanoparticles as highly durable electrocatalyst

Replacing expensive platinum metal as catalyst is a tremendous challenge for large-scale application of fuel-cell technology. In addition to high cost, pure Pt is neither the most active nor the most stable catalyst for fuel cell reactions. Here, we report on a novel multimetallic catalyst based on core/shell Au/FePt3 nanoparticles with advanced properties and enhanced stability for the oxygen reduction reaction.

Read more: Multimetallic Au/FePt nanoparticles as highly durable electrocatalyst