Temperature- and field-induced entropy changes in nanomagnets

Temperature- and field-induced entropy changes in nanomagnets

Temperature-and field-induced entropy changes in nanomagnets" (2008). Ralph Skomski Publications. Paper 53.

Temperature dependence of spin-transfer-induced switching of nanomagnets.

We measure the temperature, magnetic-field, and current dependence for the switching of nanomagnets by a spin-polarized current. Depending on current bias, switching can occur between either two static magnetic states or a static state and a current-driven precessional mode. In both cases, the switching is thermally activated and governed by the sample temperature, not a higher effective magnet...

Nanocomputing by Field-Coupled Nanomagnets

We demonstrate through simulations the feasibility of using magnetically coupled nanometer-scale ferromagnetic dots for digital information processing. Microelectronic circuits provide the input and output of the magnetic nanostructure, but the signal is processed via magnetic dot–dot interactions. Logic functions can be defined by the proper placements of dots. We introduce a SPICE macromodel ...

Surface-induced cubic anisotropy in nanomagnets

– We investigate the effects of surface anisotropy in a spherical magnetic nanoparticle. By computing minor loops, 2D and 3D energyscape, and by investigating the behaviour of the net magnetisation, we show that the behaviour of a many-spin particle is modeled by a macro-spin effective energy containing a uniaxial and cubic anisotropy terms. Introduction. – A magnetic nanoparticle exhibits many...

Field-temperature phase diagram and entropy landscape of CeAuSb2