Compensated ferrimagnetic oxides for rapid magnetic switchers (FEMAGSWIT)
Project Director: Dr. Maria Cristina BARTHA
Project ID: 676 PED din 21/06/2022
Project Director: Dr. Maria Cristina Bartha (Valsangiacom)
Project Type: National
Project Program: PED
Funded by: Romanian National Authority for Scientific Research, UEFISCDI
Contractor: National Institute of Materials Physics
Project Status: In progress
Start Date: 21 June, 2022
End Date: 21 June, 2024
Electric-field control of magnetism has remained a major challenge which would greatly impact especially data storage technology, but also other types of logic and electromagnetically controlled devices. Control of magnetic properties by an electric field would enable new data storage technologies operating at low electrical power. Although the electric field could be used to manipulate a wide range of magnetic properties, e.g. Curie temperature, magnetic moment, coercivity, and magnetic anisotropy, the realization of 180° magnetization switching could only be obtained in few systems.
The scope of this project is to obtain and validate an advanced material, namely a rare earth garnet of RE3Fe5O12 type (RIG), with RE=Tb, Gd, Dy and Ho for future generations of electronic devices. The project’s general objective is to select a material (demonstration model) with suitable magnetic properties for high performance spintronic applications, namely a magnetic switching device.
The proposed material will be obtained by our original technological route that combines a cheap and facile surfactant assisted hydrothermal method to prepare mesoporous RE3Fe5O12 structures followed by Spark Plasma Sintering (SPS) and post-annealing to consolidate the obtained nanoparticle powders into high-density nano structured bulks with controlled and refined properties.
The challenge of this project is to select a material in which we could achieve a fast and robust switching of magnetization under low current excitation near room temperature. For comparison, materials obtained by the classical method (solid state reaction) will also be assessed.
Dr. Maria Cristina Bartha (Project Director)
Dr. Victor Kuncser
Dr. Petre Badica
Dr. Cezar Comanescu
Dr. Alina Crisan
Dr. Andrei Kuncser
Dr. Mihai Alexandru Grigoroscuta
Ph.D Student Andrei Alexandru-Dinu
MSc. Student Ani Sergentu
Stage I summary:
In this first stage of the project, oxide precursor nanopulbers with garnet structure of RE3Fe5O12 type were prepared, where RE= Gd, Tb, Dy and Ho and were complexly characterized both from a structural and morphological point of view. In order to obtain the materials, two processing methods were used (one of them being used for the first time on this type of compounds). At the same time, several studies related to the evolution of properties have been carried out, at this stage, the emphasis being placed on the magnetic properties of oxides with garnet structure obtained by the classical method.
Web of Science articles - published or accepted:
- "Advance of Nanoparticles and Thin Films", Bogdana Borca and Cristina Bartha, Coatings 2022, 12(8), 1138; https://doi.org/10.3390/coatings12081138
- "Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni49Mn32Ga19 Ferromagnetic Shape Memory Ribbons", Tolea, F.; Popescu, B.; Bartha, C.; Enculescu, M.; Tolea, M.; Sofronie, M., Magnetochemistry 2023, 9, 7. https://doi.org/10.3390/magnetochemistry9010007
- "Up-Conversion Luminescence and Magnetic Properties of Multifunctional Er3+/Yb3+-Doped SiO2-GdF3/LiGdF4 Glass Ceramics", Secu, C.; Bartha, C.; Radu, C.; Secu, M. Magnetochemistry 2023, 9, 11. https://doi.org/10.3390/magnetochemistry9010011
- Cristina Bartha, Andrei Alexandru Dinu, Cezar Comanescu, Simona Greculeasa, Nicusor Iacob, Aurel Leca, and Petre Badica, "Rare earth garnet of Gd3Fe5O12 type for future generation of electronic devices", 7th edition of the International Workshop Of Materials Physics, Recent Trends in Magnetism and Superconductivity, 31 of August- 2 of September, Magurele, 2022 ( poster ).
Maria Cristina Bartha (Valsangiacom), PhD in Physics
Senior Researcher III
Telephone: +40-(0)21-2418 146
Department: Magnetism and Superconductivity
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