Matsumoto, K orcid.org/0000-0002-3433-2041, Kimata, M orcid.org/0000-0003-4936-2988, Kondou, K orcid.org/0000-0002-3020-3189 et al. (3 more authors) (2018) Magnetothermodynamic properties and anomalous magnetic phase transition in FeRh nanowires. IEEE Transactions on Magnetics, 54 (11). ARTN 2300904. ISSN 0018-9464
Abstract
Thermal properties of submicron wires of Pd-doped FeRh alloys are evaluated from measurements of transport properties around the first order antiferromagnetic to ferromagnetic phase transition. Recently, in a submicron wire of FeRh alloy, an asymmetric structure between heating and cooling processes was reported in the vicinity of the phase transition temperature. A system where finite-size effects appear is expected to show different magnetic and thermal properties from those in bulk and thin film. However, thermal or magnetization measurements are difficult to perform on samples with such a tiny volume. Here, we demonstrate a quantitative evaluation of thermal properties in thin films and submicron wires of B2-ordered Pd-doped FeRh alloy grown on MgO (001). Resistivity measurements on a series of wires with different width reveal that the anomaly in the resistance change is enhanced in narrow wires. As the transport properties in submicron wires sensitively reflect those magnetic states, the entropy change and irreversible energy loss during the first order phase transition have been determined via resistance measurements. We find a larger energy loss in smaller samples where wider hysteresis loops appear in temperature-driven measurements. This method can be a probe to evaluate the finite-size effect induced by a restricted magnetic domain nucleation process during the phase transition.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. |
Keywords: | FeRh alloys, first order phase transition, metamagnetic transition, thin films, submicron wires. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/M018504/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 Apr 2018 13:29 |
Last Modified: | 16 Dec 2024 14:57 |
Status: | Published |
Publisher: | IEEE |
Identification Number: | 10.1109/TMAG.2018.2832191 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:130028 |