Hydrogen-Controlled Spin Reorientation Transition in a Nanometer-Thick FePd Layer on Co/[Pt/Co]<sub>4</sub>/Pt Multilayers for Applications in Spintronics

Hsueh, Kun-Jen; Chang, Ping; Liaw, Li-Jie; Dhanarajagopal, Alltrin; Lin, Minn-Tsong; Lin, Wen Chin

doi:10.1021/acsanm.2c05095

Cited by 3 publications

(1 citation statement)

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“…Fe x Pd 100– x alloys have been the subject of extensive study due to the wide range of phases they exhibit, each possessing unique magnetic, magnetotransport, mechanical, and catalytic properties, offering the possibility of integrating diverse functionalities into a single material. Their diverse range of properties and potential applications range for spintronics, , sensing, − magnetostrictive, , and biomedical technologies.…”

Section: Introductionmentioning

confidence: 99%

Tracking of the Multimodal Ordering Process in FePd Alloy

Zarzycki,

Perzanowski,

Krupinski

et al. 2024

J. Phys. Chem. C

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This work presents the process of phase transformation and chemical ordering in an FePd alloy thin film. The study focuses on a multilayered Fe/Pd system undergoing a postdeposition annealing process. The annealing induces morphological and structural changes in the samples, which were observed by using scanning electron microscopy, X-ray reflectivity, and conversion electron Mossbauer spectroscopy. The microscopic structural properties were examined at various stages of annealing to track the progress of the chemical ordering and transformation. Our findings reveal that the transformation to the L1 0 phase occurs through a multiphase process with two distinct paths: first, with stoichiometric (A1−A6), and second, off-stoichiometric (L1 2 -L1′) intermediate phases. Both paths start with cubic fcc structures that undergo tetragonal distortion and successive chemical ordering to the L1 0 phase. The observed increase in transformation effectiveness correlates well with the surface diffusion-induced dewetting phenomenon and a change in the kinetic phase growth process from a low-dimensional to a three-dimensional growth mechanism. These phenomena primarily affect the growth of the L1 0 phase, which is particularly interesting for material science, spintronics, and sensorics. The use of conversion electron Mossbauer spectroscopy allows us to study of these effects at an atomic level not accessible by other techniques.

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