CIC01: Master project on IMPROVING MAGNETIC REFRIGERATION EFFICIENCY BY MEANS OF NANOSCALE MATERIALS DESIGN
The goal of this Master project is to create high-quality magnetic films, that exhibit a nanometer scale depth dependence of their composition and thus a depth dependence of their microscopic magnetic properties, such as exchange coupling constants or magneto-crystalline anisotropy. Such film structures exhibit non-uniform magnetization states by design, which leads to relevant modifications of their magnetic phase transitions and associated to that, their efficiency for magnetic refrigeration. Indeed, we recently demonstrated that nano-scale materials design enables the management of phase transitions in a far broader sense than otherwise feasible, implying broad-based device and general application relevance. The thesis will explore specific aspects of this materials design approach and accordingly, the main goals of this work are to:
- study and identify suitable fabrication conditions for such thin films
- fabricate high-quality magnetic films with designed non-uniform depth profiles
- characterize their magnetic behavior, in particular their phase transitions
- analyze how non-uniform designs impact their magnetic refrigeration efficiency
These goals are not only of substantial scientific, but also of technological interest because already today, key technologies are based on magnetic films with non-trivial depth structures, and associated device operations typically include phase transitions. Modern fabrication techniques, such as the Ultra High Vacuum Sputter system at CIC nanoGUNE, allow for the precise fabrication of such films, in which different ferromagnetic layers can be deposited and manipulated with sub-nm precision while maintaining single-crystal structural control.
In the first part of the Master project, different ferromagnetic alloy films will be fabricated. Subsequently, their magnetic properties and states will be measured and classified by using a superconducting quantum interference device (SQUID). The project will involve the fabrication and characterization of samples as well as the analysis of experimental results. Some prior knowledge of solid-state physics and ferromagnetism will be beneficial but is not a prerequisite.
Description of the research group:
The nano-magnetism Group at CIC nanoGUNE is conducting world-class basic and applied research in the field of magnetism in nano-scale structures. The Group staff has a longstanding expertise and proven track record in fundamental and applied aspects of nano-magnetism.
If you are a (prospective) master student and you are interested in this project, please get in touch with the scientist in charge: Andreas Berger (email@example.com).
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