11-01-2024-vl Hysteresis in Magnetic Materials

Lehrende: Prof. Dr.-Ing. Oliver Gutfleisch; Dr. Konstantin Skokov

Veranstaltungsart: Vorlesung

Orga-Einheit: FB11 / Materialwissenschaft

Anzeige im Stundenplan: Hyst. in Mag. Mat.

Fach:

Anrechenbar für:

Unterrichtssprache: Englisch

Min. | Max. Teilnehmerzahl: - | -

Lehrinhalte:

• Magnetism and hysteresis
  
• Physics of magnetic materials: from isolated moments to ordered arrangements.
  
• Magnetic domains
  
• Micromagnetic theory
  
• Coercivity mechanisms
  
• Hard magnetic materials: maximizing hysteresis
  
• Hysteresis in fine particles and nanostructured materials: below the critical single-domain size
  
• Soft magnetic materials: eliminating hysteresis
  
• Thermodynamics of magnetic solids
  
• Hysteresis in magnetoelastic materials: magneto-structural coupling
  
• Hysteresis in magnetocaloric materials: balancing near critical point
  
• Hysteresis in magnetic multiferroics and heterostructures: combining magnetic behavior with additional desirable properties
  
• Magnetic materials for recording and computers
  
• Magnetic Materials in Medicine and Biology
  

Literatur:

• J. M. D. Coey, "Magnetism and Magnetic Materials", Cambridge University Press (2010)
  
• B.D. Cullity and C.D. Graham, "Introduction to Magnetic Materials", John Wiley &Sons, 2009
  
• R. O’Handley, "Modern Magnetic Materials", John Wiley &Sons, 2000,
  
• R. Hilzinger and W. Rodewald, "Magnetic Materials", VAC, 2013
  
• A. Hubert and R. Schäfer, "Magnetic Domains", Springer, 2000
  
• S. Chikazumi, "Physics of Ferromagnetism", Oxford Science Publ., 1997
  
• S. Blundell, "Magnetism in condensed matter", Oxford master Series in Cond Matt Phys., 2012
  
• D. Jiles, "Magnetism and magnetic materials", Chapman & Hall, 1991
  

Offizielle Kursbeschreibung:

• Magnetic materials are key components of energy-related (harvesting, conversion, and utilization) technologies with broad spectra of applications, such as direct drive wind turbines and e-mobility. Magnets are also important in future solid state cooling, robotics and automatisation, sensors, actuators, internet of things, and information technology based on spintronics (MRAM, neuromorphic computation). All of these technologies are expected to grow significantly in the next decades. A key property that guides the design of magnetic materials for distinct applications is the thermal and/or magnetic hysteresis. It opens up and at the same time defines the limits for the development of hard permanent magnets. On the other hand it is a source of losses that plays an important role for soft magents and limits the cyclic effects of magnetocaloric cooling technology. This lecture will cover the fundamental theory, design principles, and (micro)structure-property-relations of thermal and magnetic hysteresis. Based on these fundamentals, fabrication and applications of magnetic materials are discussed with regard to the role of thermal/magnetic hysteresis.
  

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