Experimental and theoretical evidences for the ice regime in planar artificial spin ices.
J Phys Condens Matter
; 31(2): 025301, 2019 Jan 16.
Article
in En
| MEDLINE
| ID: mdl-30521491
ABSTRACT
In this work, we explore a kind of geometrical effect in the thermodynamics of artificial spin ices (ASI). In general, such artificial materials are athermal. Here, We demonstrate that geometrically driven dynamics in ASI can open up the panorama of exploring distinct ground states and thermally magnetic monopole excitations. It is shown that a particular ASI lattice will provide a richer thermodynamics with nanomagnet spins experiencing less restriction to flip precisely in a kind of rhombic lattice. This can be observed by analysis of only three types of rectangular artificial spin ices (RASI). Denoting the horizontal and vertical lattice spacings by [Formula see text] and [Formula see text], respectively, then, a RASI material can be described by its aspect ratio [Formula see text]. The rhombic lattice emerges when [Formula see text]. So, by comparing the impact of thermal effects on the spin flips in these three appropriate different RASI arrays, it is possible to find a system very close to the ice regime.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
J Phys Condens Matter
Journal subject:
BIOFISICA
Year:
2019
Document type:
Article
Affiliation country:
Brazil