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Modeling Dynamic Magnetic Response of Spinel Soft Ferrites with the Steepest-Entropy-Ascent Quantum Thermodynamics Formalism
Deepak Dhariwal, William T. Reynolds, Michael R. von Spakovsky
Selecting soft ferrites for alternating-field applications requires balancing magnetic response, dissipation, nonlinearity, and heating. We use a field-driven steepest-entropy-asce…
Field-Driven Coupled Magnon--Phonon--Electron Relaxation in Magnetite Using Steepest-Entropy-Ascent Quantum Thermodynamic Formalism
Deepak Dhariwal, William T. Reynolds, Michael R. von Spakovsky
A field-driven steepest-entropy-ascent quantum thermodynamic (SEAQT) formulation is developed for longitudinal nonequilibrium relaxation in magnetite (FeO) with coupled ele…
Energy Eigenstates of Electrons, Magnons and Phonons in FeO (magnetite), MnFeO (jacobsite), and mixed Mn-Zn ferrites
Deepak Dhariwal, Michael R. von Spakovsky, William T. Reynolds
We report first-principles calculations of the electronic structure, magnon excitations, and phonons in magnetite (FeO), jacobsite (MnFeO), and mixed manganese-zinc…
Entropy-Driven Microstructure Evolution Predicted with the Steepest-Entropy-Ascent Quantum Thermodynamic Framework
Jared McDonald, Michael R. von Spakovsky, William T. Reynolds
A Potts model and the Replica Exchange Wang-Landau algorithm are used to construct an energy landscape for a crystalline solid containing surfaces and grain boundaries. The energy…
Steepest-Entropy-Ascent Quantum Thermodynamics Models in Materials Science
Ryo Yamada, Michael R. von Spakovsky, William T. Reynolds
Steepest-entropy-ascent quantum thermodynamics, or SEAQT, is a unified approach of quantum mechanics and thermodynamics that avoids many of the inconsistencies that can arise betwe…
Low-temperature Atomistic Spin Relaxation and Non-equilibrium Intensive Properties Using Steepest-Entropy-Ascent Quantum-Inspired Thermodynamics Modeling
Ryo Yamada, Michael R. von Spakovsky, William T. Reynolds
The magnetization of body-centered cubic iron at low temperatures is calculated with the steepest-entropy-ascent quantum thermodynamics (SEAQT) framework. This framework assumes th…
A Method for Predicting Nonequilibrium Thermal Expansion Using Steepest-Entropy-Ascent Quantum Thermodynamics
Ryo Yamada, Michael R. von Spakovsky, William T. Reynolds
Steepest-entropy-ascent quantum thermodynamics (SEAQT) is an intriguing approach that describes equilibrium and dynamic processes in a self-consistent way. The applicability is lim…