Herrera Guillermo, Robert Anthony, Gonzalez Sara, Schoeffmann Patrick, Tamion Alexandre, Tournus Florent, Bardotti Laurent, Boisron Olivier, Albin Clément, Blanchard Nicholas, Canero-Infante Ingrid, Romeo Pedro Rojo, Canut Bruno, Otero Edwige, Ohresser Philippe, Wilhelm Fabrice, Rogalev Andrei, Bugnet Matthieu, Le Roy Damien, Dupuis Véronique
Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France.
Nanoscale. 2024 Jun 20;16(24):11679-11687. doi: 10.1039/d4nr00873a.
FeRh alloys in the CsCl-type (B2) chemically ordered phase present an antiferromagnetic to ferromagnetic order transition around 370 K observed in bulk and continuous films but absent in nanoclusters. In this study, we investigate the thermal magnetic behavior of a thick film composed of assembled FeRh nanoclusters preformed in the gas phase. This work reveals a broad and asymmetric metamagnetic transition with a consequent residual magnetization at low temperature. Due to the coexistence of different grain sizes in the sample, we confront the results with a description that involves two populations of B2-FeRh particles, and the existence of a discriminating size below which the magnetic order transition does not take place.
处于氯化铯型（B2）化学有序相的FeRh合金，在体材料和连续薄膜中观察到在370K左右存在反铁磁到铁磁的有序转变，但在纳米团簇中不存在这种转变。在本研究中，我们研究了由气相中预先形成的组装FeRh纳米团簇组成的厚膜的热磁行为。这项工作揭示了一个宽泛且不对称的变磁转变，以及在低温下随之产生的剩余磁化强度。由于样品中存在不同粒径的共存情况，我们将结果与一种涉及两类B2-FeRh粒子的描述进行对比，并且存在一个临界尺寸，低于该尺寸时磁有序转变不会发生。
