Sonia Sharmin

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Estela Blaisten-Barojas

George Mason University

Isad Saric

University of Sarajevo

Pedro de Andres

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)

Khaled Dine

University of Dr moulay taher

Umit Unver

Yalova University

mahmoud hafiz

Al-Azhar University

María Cecilia Tomasini

Universidad de Buenos Aires

Sabina Begic

University of Tuzla

Franz Giessibl

University of Regensburg

Cristina Siligardi

Università degli studi di Modena e Reggio Emilia

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Papers by Sonia Sharmin

Evaluation of interlayer exchange coupling constant in the interface of a ferromagnetic bilayer by a magneto-torque measurement

The Japan Society of Applied Physics, 2017

Topotactic crystal structure transformation from spinel ferrite to wüstite in epitaxial Fe3O4 films via Kr ion irradiation

Journal of Vacuum Science and Technology, 2021

Krypton ion irradiation was carried out on Fe3O4 epitaxial thin films grown on MgO ( 0 0 1 ) subs... more Krypton ion irradiation was carried out on Fe3O4 epitaxial thin films grown on MgO ( 0 0 1 ) substrates. The spinel structure ( F d 3 ¯ m ) of Fe3O4 was found to be transformed into another structure as a result of the ion irradiation without any loss of the epitaxial relationship with the MgO substrate. Both total film thickness and, therefore, the composition ratio between Fe and O remained the same even after the ion irradiation process, as confirmed by both cross-sectional transmission electron microscope images and Rutherford backscattering analysis. An x-ray diffraction experiment revealed that the irradiated crystal possessed a rocksalt structure ( F m 3 ¯ m ), with the lattice constant being approximately half of that of Fe3O4. Ion irradiation, thus, gave rise to a topotactic crystal transformation to wustite with a composition of Fe0.75O, which is a metastable phase of iron oxides.

Topotactic phase transformation of spinel Fe 3 O 4 to FeO with rock salt structure via ion irradiation

salt structure via ion irradiation Yang Liu, Yuki Hisamatsu, Sonia Sharmin, Daiki Oshima, Takeshi... more salt structure via ion irradiation Yang Liu, Yuki Hisamatsu, Sonia Sharmin, Daiki Oshima, Takeshi Kato, Satoshi Iwata, Eiji Kita and Hideto Yanagihara. (1.Institute of Applied Physics, University of Tsukuba, 2. Nagoya Unversity) Introduction An interesting topic of recent study is how spinel materials, such as MgAl2O4, MgGa2O4 and MgIn2O4, are affected by ion implantation, a technique which can change a material’s fundamental properties. However, hardly any investigation has been carried out on irradiated spinel ferrite materials. In a previous study, we investigated the effect of Kr ion implantation on the epitaxial growth CoFe2O4 thin films, and found that the magnetization decreased due to ion irradiation causing a structural transformation from spinel to rock salt type. However, the mechanism of topotactic reaction in epitaxial films was not well explained. In this study, we focus on prototype spinel Fe3O4 thin films and investigate the structural transformation from spinel to r...

Sonia Sharmin

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