Magnetoelastic InteractionsSpringer Berlin Heidelberg, Ene 1, 1966 - 156 mga pahina The modern theory of ferromagnetic magnetization processes has from the beginning recognized the importance of magnetoelastic inter actions. Most of the magnetoelastic calculations, however, have been basecl on the theory developed by R. BECKER and others in the early 1930's. That theory has several defects; how to remedy them is the subject of this monograph. I first became aware of the shortcomings of the traditional theory thru a critical study of electric and magnetic forces, which I undcrtook as a member of the COULOMB'S Law Committee of the American Asso ciation of Physics Teachers. My conclusions were published in 1951 in the American 10Z/rnal of Physics; an application of them to a problem in magnetostriction was published in 1953 in Reviews oflvlodern Physics. With the development, in 1956, of the "nucleation field" theory of micromagnetics, the need for a systematic and self-consistent theory of magnetoelastic interactions became more pressing. The traditional theory predicted that the nucleation field should differ negligibly from that of a rigid body; but my 1953 magnetostriction calculation suggested that terms omitted in that theory might be important. In the academic year 1963/64, 1 was finally able - thanks to a sabbatical furlough - to find the time needed for systematic development of a basic theory of magnetoelastic interactions in a ferromagnet. |
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Introduction | 1 |
Concepts of Elasticity Theory | 28 |
Thermodynamic Principles | 41 |
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anisotropy applied field approximation arbitrary atom axes axis B₁ boundary conditions BROWN C₁ calculation Cijkl circuit components COULOMB'S Law defined deformation deformation gradients density derived dipole dipole-dipole displacement domain theory elastic constants elasticity theory ellipsoid equivalent exchange forces expression ferromagnetic field intensity finite force and torque forces exerted formulas free energy function gradients H₁ H₂ integral interaction K₁ linear M₁ magnetic equilibrium equations magnetic force magnetic moment magnetized body magnetostatic magnetostriction mass element mechanical equilibrium n₁ n₂ nonmagnetic notation P₁ particle physical poles postulates quantities replace rigid body rotation S₁ second order self-energy specimen strains stress surface forces symmetric t₁ tensor term in Eq theorem theory thermodynamic potential torque TOUPIN transformed undeformed coordinates uniform unit mass vanish variations vector volume X₁ zero α₁ α₂ ατ