The Piezomagnetism interface (

), found under
Electromagnetics–Structure Interaction (

) branch within the
Structural Mechanics branch (

) or the
Electromagnetics and Mechanics (

) branch within the
AC/DC branch (

) when adding a physics interface, combines Solid Mechanics and Magnetic Fields together with the constitutive relationships required to model linear magnetostrictive materials and devices. Both the direct and inverse piezomagnetic effects can be modeled.
When a predefined Piezomagnetism interface is added from the
Structural Mechanics branch (

) of the
Model Wizard or from
Add Physics windows,
Solid Mechanics and
Magnetic Fields interfaces are added to the Model Builder.
In addition, the Multiphysics node is added, which automatically includes the multiphysics coupling feature
Piezomagnetism.
The participating Solid Mechanics interface includes the default
Piezomagnetic Material feature with its selection set to all domains. The
Magnetic Fields interface gets a default
Ampère’s Law, Piezomagnetic feature with similar settings.
The Piezomagnetism multiphysics coupling node can be active only on the selection where the features Piezomagnetic Material and Ampère’s Law, Piezomagnetic are both active.
In 2D and 2D axial symmetry, adding a Piezomagnetism interface also adds predefined base-vector coordinate systems for the material’s (in the plane 2D case) XY-,
YZ-,
ZX-,
YX-,
XZ-, and
XY-planes. These additional coordinate systems are useful for simplifying the material orientation for nonisotropic materials.
When physics interfaces are added using the predefined multiphysics interface, for example Piezomagnetism, specific settings are included with the physics interfaces and the coupling features.
For example, if both Solid Mechanics and Magnetic Fields interfaces are added, COMSOL Multiphysics adds an empty Multiphysics node. You can choose the available coupling feature
Piezomagnetism but the modified settings are not included.
The Piezomagnetism coupling node is used to couple the interfaces.