Journal Article

PUBDB-2025-02436

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Enhanced perpendicular magnetic anisotropy through thermal phase transformation in Co/Pd/Ta multilayers

Rawat, K.Extern* ; Sharma, A.Extern* ; Brajpuriya, R. K.Extern* ; Reddy, V. R.Extern* ; Gloskovskii, A.DESY* ; Kaushik, V.Extern* ; Gupta, A.Extern* ; Pathak, S. (Corresponding author)Extern*

2025
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.apsusc.2025.162952

Abstract: Magnetic multilayers with high uniaxial anisotropy make them suitable for application in spintronic devices needing thermal stability. This investigation demonstrates that annealing at 300 °C can effectively introduce phase transformation of a paramagnetic cobalt oxide (CoO) thin film sandwiched between Pd and Ta layers into a ferromagnetic cobalt (Co) thin film. Reduced multilayers show a large recovery in magnetic moment, enhanced coercivity, and strong perpendicular magnetic anisotropy (PMA). In-plane hysteresis measurements reveal a stronger anisotropic field, highlighting the presence of considerable PMA. Surface roughness rises during annealing, while interface roughness decreases, indicating improved interface quality as confirmed by reflectivity. The rise in electron density implies a shift from CoO to Co which further confirms the reduction. Depth-selective standing wave hard x-ray photoelectron spectroscopy (HAXPES) analysis also confirms the reduction that takes place during thermal annealing and demonstrates the occurrence of the oxide-to-metallic phase transformation. The Co concentrations are significantly greater in bulk regions than in interface locations, showing that the reduction is dominated through bulk Co in the multilayer structure under an effective phase transformation during thermal-induced reduction.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PET-S)
2. FS DOOR-User (FS DOOR-User)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20221079 (I-20221079) (I-20221079)
4. INDIA-DESY - INDIA-DESY Collaboration (2020_Join2-INDIA-DESY) (2020_Join2-INDIA-DESY)

Experiment(s):

1. PETRA Beamline P22 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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