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Title: Customizing the first-order magnetic phase transition in FeRh
Author: Gómez Olivella, Carles
Director/Tutor: Fina, Ignasi
Keywords: Transformacions de fase (Física estadística)
Materials ferromagnètics
Treballs de fi de grau
Phase transformations (Statistical physics)
Ferromagnetic materials
Bachelor's thesis
Issue Date: Jun-2018
Abstract: The FeRh alloy’s first-order magnetic phase transition from antiferromagnetic (AFM) to ferromagnetic (FM) state is brought into discussion in this paper. Five indented regions of a 55 nm thick thin films grown onto MgO substrate were prepared to analyse as a function of temperature and indentation force via X-Ray transmission technique. First, a set of reflexions from {110}, {111}, {200}, {202}, {210} and {211} crystallographic planes were identified from the X-Ray data. The interplanar distance-temperature dependence was extracted revealing that transition temperature starts at around 420 K. An approximately 1% lattice constant dilation from one phase to the other was expected, whereas our experimental results estimate a 0,76% augment suggesting that transition was not completely overpassed. Moreover, the interplanar distance-force dependence has been compared between two different temperatures (343 and 423 K), one in the antiferromagnetic state and the other between both states. Increasing the external force on the sample has shown that the interplanar distance-force decreases at high temperature and not at low temperature. We argue that this different behaviour results from an increase of the transition temperature. The {111} MgO-substrate plane reflexions were also analysed for comparison.
Note: Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2018, Tutor: Ignasi Fina
Appears in Collections:Treballs Finals de Grau (TFG) - Física

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