Study of the magnetic and magnetocaloric properties of amorphous alloys formed by the ErxFe100−x series

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2024-11-27 DOI:10.1016/j.jnoncrysol.2024.123336

V.L.O. Freitas, P.P. Almeida Neto, S.S. Costa, B.P. Alho, P.O. Ribeiro, V.S.R. de Sousa, P.J. von Ranke, E.P. Nóbrega

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引用次数: 0

Abstract

In this work, we investigate the magnetic and thermodynamic properties and the magnetocaloric effect of amorphous alloys formed from the series

{Er}_{x} {Fe}_{100 - x}

. To calculate the quantities on which the study is based, we use a Hamiltonian of interacting spins with two magnetic sublattices treated by the HPZ model, a modified Heisenberg Hamiltonian, in which each ionic spin is subject to a local anisotropy field of random orientation. The amorphous alloys studied present ferrimagnetic phase transitions, explained by the magnetic matrix composed of Er and Fe atoms. As a consequence, depending on the Fe doping, compensation temperatures, and inverse magnetocaloric effects are observed. Considerable values of refrigerant capacity in units of J kg

^{- 1}

under the variation of 5

T

of the applied magnetic field were found: 364, 380, 349, 291, and 237 for

x = 8.5, 10, 16.5, 21.5

and 28, respectively.

Abstract Image

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由 ErxFe100-x 系列形成的非晶合金的磁性和磁致性研究

在这项工作中，我们研究了由 ErxFe100-x 系列形成的非晶合金的磁性和热力学性质以及磁致效应。为了计算作为研究基础的量，我们使用了一个具有两个磁性子晶格的相互作用自旋的哈密顿，该自旋由 HPZ 模型（一种改进的海森堡哈密顿）处理，其中每个离子自旋都受到一个随机取向的局部各向异性场的影响。所研究的非晶合金呈现出铁磁性相变，其原因在于由 Er 原子和 Fe 原子组成的磁性基体。因此，根据铁的掺杂情况，可以观察到补偿温度和反磁性效应。在 5 T 的外加磁场变化下，以 J kg-1 为单位的制冷剂容量值相当可观：x=8.5、10、16.5、21.5 和 28 时分别为 364、380、349、291 和 237。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.