Sökning: "magnetocaloric materials"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden magnetocaloric materials.

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

    Master-uppsats, Uppsala universitet/Materialteori

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

    Sammanfattning : 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. LÄS MER

  3. 2. Quantum statistics and the magnetocaloric effect

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Anna Sandberg; [2020]
    Nyckelord :quantum statistics; magnetocaloric effect; magnetocaloric; magnetic cooling; simulation;

    Sammanfattning : 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. LÄS MER

  4. 3. Setup Implementation for a Direct Measurement Technique of the Magnetocaloric Effect

    Kandidat-uppsats, KTH/Materialvetenskap

    Författare :Ferdinand Posva; [2020]
    Nyckelord :Magnetocaloric effect; Direct method; Gadolinium; High entropy alloys;

    Sammanfattning : This project presents an attempt to construct a setup and implement a reliable technique for measuring the magnetocaloric effect (MCE) on various materials via a direct method for the acquisition of the data. The main objective of the latter is to produce a ∆Tadiabatic vs T graph over a reasonable temperature span (-100◦C up to 220◦C) by thermal monitoring of a magnetic material exposed to an oscillating magnetic field with a maximum strength of 1. LÄS MER

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

    Master-uppsats, Uppsala universitet/Materialteori

    Författare :Johan Bylin; [2019]
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  7. 5. Magnetic Properites in Alloy Systems

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Materialvetenskap

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

    Sammanfattning : 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. LÄS MER