Essays about: "magnetic entropy change"

Found 5 essays containing the words magnetic entropy change.

  1. 1. The Magnetocaloric Effect in Antiferromagnetic and Noncollinear Magnets

    University essay from Uppsala universitet/Materialteori

    Author : Siri Alva Berge; [2023]
    Keywords : magnetocaloric effect; atomistic spin dynamics; monte carlo; antiferromagnet; neodymium; noncollinear magnetism;

    Abstract : The magnetocaloric effect (MCE) is the temperature change in a magnetic material due to a change in an applied magnetic field. How the MCE behaves in different magnetic materials and at different phase transitions is fundamental to understand. READ MORE

  3. 2. Using satellite data to calculate entropy of electrons at collisionless shocks

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Sofie Berglund; Alice Wallner; [2022]
    Keywords : entropy; electrons; plasma; Earth’s bow shock; magnetic field; collisionless shock; plasma beta; Alfv´en Mach number; MMS; NASA; satellite; IRF;

    Abstract : The solar wind is a supersonic flow of protons and electrons emitted in all directions from the sun. As the supersonic solar wind encounters Earth’s magnetic field, it creates the Earth’s bow shock, which increases the kinetic entropy of electrons passing through it. READ MORE

  4. 3. Quantum statistics and the magnetocaloric effect

    University essay from Uppsala universitet/Materialteori

    Author : Anna Sandberg; [2020]
    Keywords : quantum statistics; magnetocaloric effect; magnetocaloric; magnetic cooling; simulation;

    Abstract : Caloric materials show prospect in replacing the function of vaporcompression systems in todays cooling devices, resulting in more energy efficient cooling and eliminating the need for refrigerents which contribute to climate change. This project has focused on magnetocaloric materials, which experience changes in temperature when exposed to magnetic fields. READ MORE

  5. 4. Best practice of extracting magnetocaloric properties in magnetic simulations

    University essay from Uppsala universitet/Materialteori

    Author : Johan Bylin; [2019]
    Keywords : Magnetocaloric effect; Thermodynamics; Statistical mechanics; Monte Carlo simulations; Metropolis algorithm; Wang-Landau method; Isothermal change in entropy; Adiabatic change in temperature; Numerical methods; Effective spin models;

    Abstract : In this thesis, a numerical study of simulating and computing the magnetocaloric properties of magnetic materials is presented. The main objective was to deduce the optimal procedure to obtain the isothermal change in entropy of magnetic systems, by evaluating two different formulas of entropy extraction, one relying on the magnetization of the material and the other on the magnet's heat capacity. READ MORE

  6. 5. Magnetic Properites in Alloy Systems

    University essay from Luleå tekniska universitet/Materialvetenskap

    Author : Nanny Strandqvist; [2017]
    Keywords : Magnetocaloric effect; adiabatic temperature change; magnetic entropy change; magnetocaloric materials; magnetic refrigerator;

    Abstract : The attention for materials displaying high magnetocaloric effect (MCE) has grown during the past 30 years. One of the most important properties of MCE is the adiabatic temperature change ( ). The main aim of this work was to develop a method to measure the temperature change ( ) for magnetocaloric materials in a changing magnetic field. READ MORE