WP 5: Magnetic Interactions and Modeling of Reversal
Description of Work: Provide a feedback loop using as input the parameters of the characterization and predicting/optimizing the systems to be prepared in a “virtual-fabrication” fashion. Establish a quantifiable interpretation of the data towards understanding complex interaction dependent reversal mechanisms in assemblies of hard magnetic nanoparticles. FORC analysis of large families of hysteretic curves done to get a full map of existing coercive and interaction field distributions and possible asymmetries in order to build realistic models of the magnetic behavior.
The work package consists of the following tasks:
Task 5.1 In selected samples with promising hysteretic behavior specialized characterization will include FORC analysis of the families of reversal curves in order to get a full map of existing switching and interaction field distributions and possible asymmetries.
Task 5.2 For predicting the properties large interacting particle assemblies micromagnetic simulations using the finite differences simulation GPU-accelerated software Mumax3 will be used which can perform efficiently and quickly calculations of hysteresis in complex multiphase structures.
Task 5.3 For predicting properties that of individual particles depend sensitively on the exact characteristics of micromagnetic simulations using the atomistic level software Vampire will be implemented. This approach is suitable alloying at interfaces, temperature effects but also supports ultrafast spin dynamics and quasi-static hysteresis.