# Magnetostrictive Materials

## Definition

Magnetostrictive material with losses.

## Description

The verification of the materials is not automatically done within the context of the ATILA-GiD interface. It is recommended to use CPIEZO from the ATILA supervisor to check the validity of magnetostrictive materials.

Mechanical
sH | Elastic compliance at constant Magnetic field | m2/N

Coupling
d | Piezomagnetic constants | m/A

Magnetic
µS/µ0 | Relative permeability at constant strain |

Losses
Delta M | Mechanical loss angle
Delta P | Piezomagnetic loss angle
Delta D | Magnetic loss angle
Check with CPIEZO

## Illustration

## ATILA Implementation

- ATILA can use a different loss angle for every constant. In the interface, and as is usually done, we simplify this situation by using one loss angle per tensor.
- The dielectric loss angle (δd) is defined as the ratio of the imaginary to the real parts of the dielectric permittivities at constant stress.

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