Multiferroic composites for magnetic data storage beyond the super-paramagnetic limit
Researchers in the Applied Materials Laboratory
at the University of Portsmouth led by Dr Vopson, in collaboration with
colleagues from Institute Jozef Stefan - Slovenia, published a novel concept of
multiferroic magnetic data storage that functions beyond the super-paramagnetic
limit.
JOURNAL OF APPLIED PHYSICS 116, 113910 (2014)
Abstract
Ultra high-density magnetic data storage requires magnetic grains of <5 nm diameters. Thermal stability of such small magnetic grain demands materials with very large magneto-crystalline anisotropy, which makes data write process almost impossible, even when Heat Assisted Magnetic Recording (HAMR) technology is deployed. Here, we propose an alternative method of strengthening the thermal stability of the magnetic grains via elasto-mechanical coupling between the magnetic data storage layer and a piezo-ferroelectric substrate. Using Stoner-Wohlfarth single domain model, we show that the correct tuning of this coupling can increase the effective magnetocrystalline anisotropy of the magnetic grains making them stable beyond the super-paramagnetic limit. However, the effective magnetic anisotropy can also be lowered or even switched off during the write process by simply altering the applied voltage to the substrate. Based on these effects, we propose two magnetic data storage protocols, one of which could potentially replace HAMR technology,
with both schemes promising unprecedented increases in the data storage areal density beyond the super-paramagnetic size limit. VC 2014 AIP Publishing LLC.
[http://dx.doi.org/10.1063/1.4896129]
About us
Vopson research is a blog associated with Dr Vopson's Physics research activities at the University of Portsmouth, School of Mathematics and Physics, Faculty of Technology.
Applied Materials Laboratory (AML) Blog launch
The lead scientist of the Applied Materials
Laboratory (AML) at the University of Portsmouth has officially launched the
AML Blog on the 19th of March 2014.
The Blog will offer regular updates on the core teaching and research activities within this laboratory.
The Blog will offer regular updates on the core teaching and research activities within this laboratory.
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