Pierre Weiss (1865–1940) was a French physicist known for his contributions to the fields of magnetism and crystallography. He is particularly noted for his work on magnetic properties of materials and the Weiss theory of ferromagnetism. Weiss introduced the concept of the "Weiss domain," which describes the formation of small regions within ferromagnetic materials where the magnetic moments of atoms are aligned, contributing to the overall magnetic behavior of the material.
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