D. A. Garanin, Saaber Shoyeb
Theory of magnetic deflagration taking into account dipolar-controlled spin
tunneling has been applied to the realistic model of molecular magnet Mn_12 Ac.
At small transverse field, the front speed v has tunneling maxima on the bias
field B_z reflecting those of the molecular spin's relaxation rate calculated
from the density-matrix equation. At high transverse field, spin tunneling
directly out of the metastable ground state leads to front speeds that can
exceed the speed of sound. Both for the weak and strong transverse field, the
spatial profile of the deflagration front near tunneling resonances shows a
front of tunneling that triggers a burning front behind it.
View original:
http://arxiv.org/abs/1112.5171
No comments:
Post a Comment