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Last update: Mgr. Kateřina Mikšová (03.08.2021)
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Last update: Mgr. Kateřina Mikšová (03.08.2021)
S.Krupička: Fyzika feritů, Academia, Praha 1969.
J.Šternberk: Úvod do magnetismu pevných látek, SPN, Praha 1979
V.Hajko, L.Potocký, A.Zentko: Magnetizačné procesy, Alfa, Bratislava 1982
S.V.Vonsovskij: Magnetizm, Nauka, Moskva 1971.
Elements of Theoretical Magnetism, Academia, Praha 1968.
J.Crangle: The Magnetic Properties of Solids, E.Arnold, London 1977 |
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Last update: Mgr. Kateřina Mikšová (03.08.2021)
1. Diamagnetism and paramagnetism.Orbital and spin magnetic moment of atomic and itinerant electrons in solids. Hund rules and their application for ions of transition elements. Larmor precession and diamagnetism of atomic electrons. Diamagnetism of weakly interacting atoms and molecules in nonmetallic solids. Landau diamagnetism of itinerant electrons. Diamagnetism of superconductors. Paramagnetism of systems of weakly interacting atoms and ions ? Langevin, Brillouin and Van Vleck theory. The influence of crystalline electric field in paramagnetic materials, the quenching of orbital moment. Pauli spin paramagnetism of itinerant electrons. Methods of measurement of magnetic susceptibility. 2. Ferromagnetism.Experimental determination of participation of orbital and spin motion of electrons to the formation of magnetic moment of materials. Weiss phenomenological theory of ferromagnetism. Heisenberg quantum theory. Direct exchange interaction of electrons. Bethe ? Slater criteria of ferromagnetism. Holstein ? Primakoff theory of spin waves. Temperature dependence of spontaneous magnetization of ferromagnets ? Bloch law. Band theory of metallic ferromagnets. Occurrence of ferromagnetism in metals, compounds and alloys. Thermal, mechanical and electrical phenomena associated with ferromagnetic state. Phase transitions in ferromagnets. 3. Antiferromagnetism and ferrimagnetism.Typical crystal structures of antiferromagnets and ferrimagnets. Normal, inverse and mixed spinels, perovskites and garnets. Néel theory of molecular field, superexchange. Spin wave theory of antiferromagnets and ferrimagnets. More general types of exchange effects and magnetic order. Use of elastic and inelastic neutron scattering for the study of magnetic order and elementary magnetic excitations. 4. Domain structure and magnetization process.Origin of domain structure in magnetically ordered materials and methods of its observation. Exchange, magnetocrystalline, magnetoelastic and demagnetization energy in magnetic materials. Bloch and Néel transition walls between domains, various types of domains. Magnetization curve, contribution of individual mechanisms in the magnetization process. Initial permeability, coercive force, remanent magnetization. Soft and hard magnetic materials. Magnetic thin films. Practical applications of magnetic materials. 5. Magnetic relaxation and resonance processes.Paramagnetic relaxation, spin-spin and spin-lattice relaxation. Electron paramagnetic resonance, nuclear magnetic resonance. Ferromagnetic, antiferromagnetic and ferrimagnetic resonance. Application of magnetic resonance methods for the study of materials and their other applications in practice. |