Theory of magnetic deflagration in crystals of molecular magnets

Magnetic deflagration inGd5Ge4

“…[22][23][24][25][26][27][28][29] The dependence of avalanches on the initial state, initial temperature, and magnetic field agrees with the theory of deflagration. 30 Since magnetic transition in Gd 5 Ge 4 also involves structural transformation, it represents an interesting example of the magnetostructural deflagration.…”

“…7͔. The expression for the velocity in the theory of deflagration is 30 v ϳ ͓͑k B T f /U͒͑T f ͒⌫͑T f ͔͒ 1/2 , ͑6͒…”

“…32 Faster magnetic relaxation may only occur via deflagration. 30 Similarly, in glassy magnetic materials, such as manganites and Gd 5 Ge 4 , fast nondissipative nucleation kinetics of a stable phase out of the metastable phase would be arrested by randomness. When the degree of metastability is not very high, this process in Gd 5 Ge 4 occurs via random proliferation of FM clusters.…”

“…[19][20][21] The latter avalanches have been investigated and successfully described [22][23][24][25][26][27][28][29] within theory of magnetic deflagration. 30 Deflagration is a physical term for slow burning that occurs, e.g., in a combustion engine when a chemical reaction in the fuel-air mixture is ignited by a spark of fire. 31 It is characterized by the propagation of a flame that separates the unburned substance ahead of the flame from the burned substance behind the flame.…”

Effects of quantum mechanics on the deflagration threshold in the molecular magnetMn12acetate

“…According to the theory of magnetic deflagration, 13 the threshold for ignition of the deflagration front is achieved when the rate, ⌫, of the transition out of the metastable well exceeds a critical value,…”