We investigate thermal stability of magnetic wall structure which is confined geometrically in a nano-contact. We measure free-energy as a function of magnetizations which characterize magnetic wall structures. Thermal stability is estimated from the free-energy barrier ΔF beyond which the system translates to another state. The typical value of k-1 BΔF is a few thousand Kelvin when the height of nano-contacts is 8 nm. The optimum shape of the nano-contact as magnetoresistance devices is clarified by examining the shape dependence of the free-energy barrier.
ASJC Scopus subject areas
- Physics and Astronomy(all)