Observation of Cluster Glass and Griffiths‐like Phase in Fe3O4 Nanostructures. Issue 2 (13th September 2020)

• Record Type: Journal Article
• Authors: Revathy, Ramany; Varma, Manoj Raama; Surendran, Kuzhichalil Peethambharan
• Is Part Of: Physica status solidi. Volume 258:Issue 2(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-13
• Subjects: alternating current susceptibility -- dynamic scaling analysis -- Griffith-like phases -- magnetite -- X-ray photoelectron spectroscopy; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.202000341
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : In the present investigation, the rare occurrence of Griffiths‐like phase (GP) in Fe3 O4 (magnetite) nanostructures is observed for the first time. Initially, Fe3 O4 monodispersed nanoparticles and an intercalated ensemble of nanoparticles and nanorods are successfully synthesized by a facile one‐step synthesis. The magnetization, as a function of the applied field, confirms the absence of superparamagnetism in both samples. The thermomagnetic data at cryogenic temperatures show glassy nature, and the alternating current (AC) susceptibility measurements confirm the existence of cluster glass. The low‐field direct current (DC) magnetization measurements of Fe3 O4 nanostructures show an anomalous magnetic behavior, which indicates the presence of GP above its Curie temperature. This unusual behavior is attributed to the presence of short‐range magnetic correlations and ferromagnetic clusters present in the system due to the size reduction. Abstract : This is the first report on the observation of Griffiths‐like phase (GP) in magnetite (Fe3 O4 ) nanostructures. The AC susceptibility measurements and dynamical scaling analysis confirm the cluster glass formation.