Synthesis and characterization of ultra-high anisotropy magnetic ferrites

Date: Wednesday, 7 May 2025

Time: 11.00 AM

Venue: Institut de Ciència de Materials de Barcelona (ICMAB, CSIC) - Sala d'Actes Carles Miravitlles and ONLINE (Register here)

Abstract

The rapid transition to a “Data-centric society” and the emergence of the new Internet of Things requires revolutionary changes in wireless communication and data storage systems. In this context it is crucial to develop new functional materials for devices operating above 100 GHz and high-density magnetic memories suitable for data storage applications. Research interests grew in novel rare-earth free materials that show potential for these applications and thus, ultra-hard ferrites exhibiting large-magneto-crystalline anisotropy and natural ferromagnetic resonance at frequencies above 100 GHz are very attractive. Two ferrites, ε-Fe₂O₃ and Sr_1-(x/12)Ca_(x/12)Al_xFe_12-xO₁₉, exhibit such properties and have been studied in this thesis. The research has focused on the up-scalable synthesis of large size ε-Fe₂O₃ phase by a sustainable and economical route and in the study of its magnetic properties by transition metal substitutions of Fe³⁺. For the second system of interest, Sr_1-(x/12)Ca_(x/12)Al_xFe_12-xO₁₉, we have studied the influence of the Fe³⁺ substitution by Al³⁺ using Synchrotron and neutron diffraction studies with the aim of understanding the origin of the high magnetic anisotropy in these ferrites.

Supervisors

• Martí Gich, ICMAB-CSIC, Spain

PhD Committee 

• President: Jiří Tuček, University of Pardubice, Czech Republic
• Secretary: Marta Estrader Bofarull, University of Barcelona, Spain
• Vocal: Matilde Saura Múzquiz, Universidad Complutense de Madrid, Spain

University: Universitat Autònoma de Barcelona (UAB)

PhD Programme: Materials Science