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


Project summary: 

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:

  1. "Advance of Nanoparticles and Thin Films", Bogdana Borca and Cristina Bartha, Coatings 202212(8), 1138;
  2. "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 20239, 7.
  3. "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 20239, 11.

International Conferences:

  1. 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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