Overview#
The MaMMoS magnetic materials ontology is a domain ontology which uses EMMO as top and middle level ontology. The magnetic material ontology reflects the hierarchical structure of the magnet. It reveals its physical parts at different length scales.
Magnet#
A magnet is functionally defined material. Possible subclasses of a magnet are bulk magnet, thin film magnet, or multilayer magnet. A magnet may have a granular microstructure.
Bulk Magnet#
A bulk magnet is a piece of matter made of one or more magnetic material.
Granular Microstructure#
The spatial parts of the granular microstructure are the main magnetic phase, the grain boundary phase, and secondary phase.
The granular microstructure consists of a main magnetic phase, possible grain boundary phases, and secondary phases.
Magnetic material#
The main magnetic phase is a magnetic material. A magnetic material has intrinsic magnetic properties and a chemical composition. A magnetic material can be amorphous or crystalline.
Crystalline magnetic material#
A crystalline magnetic material is a granular structure. Properties of the granular structure are a crystal structure and a grain size distribution. X-ray diffraction data may have been measured.
Intrinsic magnetic properties#
The intrinsic magnetic properties depend on the chemical composition and the crystal structure. They are a property of the magnetic material.
Extrinsic magnetic properties#
Whereas the intrinsic magnetic properties are a property of a magnetic material, the extrinsic magnetic properties depend on the microstructure and shape of the magnet. They are a property of the magnet. An important subset of the extrinsic magnetic properties are the magnetic hysteresis properties.
