2,126 research outputs found
Dipolar spin-misalignment correlations in inhomogeneous magnets: comparison between neutron scattering and micromagnetic approaches
In inhomogeneous bulk ferromagnets, the dominating sources of spin disorder
are related to spatial variations of (i) the magnitude of the local saturation
magnetization and of (ii) the magnitude and/or direction of the magnetic
anisotropy field. For the particular example of a porous ferromagnet, where the
magnetization inhomogeneity is at maximum, we demonstrate, by means of
experimental neutron scattering data and micromagnetic simulations, the
anisotropic character of magnetization fluctuations induced by the dipolar
interaction
The Short-term Memory (D.C. Response) of the Memristor Demonstrates the Causes of the Memristor Frequency Effect
A memristor is often identified by showing its distinctive pinched hysteresis
curve and testing for the effect of frequency. The hysteresis size should
relate to frequency and shrink to zero as the frequency approaches infinity.
Although mathematically understood, the material causes for this are not well
known. The d.c. response of the memristor is a decaying curve with its own
timescale. We show via mathematical reasoning that this decaying curve when
transformed to a.c. leads to the frequency effect by considering a descretized
curve. We then demonstrate the validity of this approach with experimental data
from two different types of memristors.Comment: Conference paper, to appear in CASFEST 2014 June, Melbourn
- …