Scientific publication by ULTIMATE-I researchers from ICN2 Spain and USM Chile: “Antisite defects and chemical expansion in low-damping, high-magnetization yttrium iron garnet films”

Dr. José Santiso (ICN2), Dr. Carlos García (USM), Dr. Cristian Romanque (USM), Dr. Loïc Henry, Dr. Nicolas Bernier, Dr. Núria Bagués, Dr. José Manuel Caicedo (ICN2), Dr. Manuel Valvidares, Dr. Felip Sandiumenge

Nanoscale epitaxial yttrium iron garnet films still pose fundamental issues regarding their interfacial behavior and impact on magnetic properties. This work shows interfacial yttrium accumulation forming octahedral antisite defects. The resulting suppression of magnetic moment from the minority sublattice results in an increased saturation magnetization. These results suggest a strong impact of unbalanced interdiffusion on magnetic behavior.

ChemNanoMat 2022, e20220

DOI: 10.1002/cnma.202200495

Repository link

All Open Access, Gold-Hybrid, Green Published

Poster presentations at JEMS 2023, Madrid (Spain)

JEMS 2023, 27th Aug. to 1st Sep. 2023, Madrid (Spain)

Luis Avilés (CNEA): “Spin transport and magnetic dynamics in ultra low damping epitaxial Co100-xFex/Ta bilayers”; authors: D. Velázquez Rodríguez, J.E. Gómez, T.E. Torres, M.H. Aguirre J. Milano, P. Costanzo, L. Avilés-Félix, A. Butera

Lara Solís (CNEA): “Temperature-dependence of ferromagnetic resonance in YIG garnets thin films”; authors: Lara M. Solís, Santiago Carreira, Javier Briático, Abdelmadjid Anane, Myriam H. Aguirre, Laura Steren

Myriam Aguirre (UNIZAR): “Synthesis of magnetite from natural pyrite for energy conversion devices”; authors: Vanina G. Franco, Adriana E. Candia, Jorge M. Núñez, Miguel Rengifo, Myriam H. Aguirre

Meeting of Marie Skłodowska-Curie Research and Innovation Staff Exchange (MSCA-RISE) participants in INMA

The second is the meeting between ULTIMATE-I and NESTOR, both Research and Innovation Staff Exchange (RISE) projects from Marie Skłodowska-Curie Action involving researchers from Spain and Argentina, amount other countries, from left to right: Alejandro Butera, Myriam Aguirre (both ULTIMATE-I) and Gerardo Goya and Enio Lima Jr (NESTOR), both RISE project at Instituto de Nanociencia y Materiales de Aragón (INMA).

Ferromagnetic films on ferroelectric substrates seminar by Alejandro Butera (CONICET)

INMA Seminar: Ferromagnetic films on ferroelectric substrates – Alejandro Butera

The INMA Seminar and RISE-ULTIMATE-I Project hosted a seminar entitled “Ferromagnetic films on ferroelectric substrates”. The seminar willtake place on 17 April 2023. The session was given by the CONICET professor and researcher Alejandro Butera, from the Instituto Balseiro de San Carlos de Bariloche-Argentina.

The seminar took place on Monday 17 April at 12h in the Aula del Edificio I+D+I, 1st floor, Campus Río Ebro.

Summary: We present a study of the effects of applying an electric field on the magnetic response of Fe89Ga11 thin films deposited on PMN-PT (011) and (001) single-crystal ferroelectric substrates. Upon application of an electric field, we have observed that the M vs.H hysteresis loops are modified in the films grown on PMN-PT (011) crystals, consistent with a positive magnetostriction constant that depends on the film thickness. From ferromagnetic resonance experiments at 9.5 GHz, we obtained a thickness-dependent magnetoelectric constant in substrates (011), with a maximum dH/dE ~150 Oe.m/MV for t = 28 nm, consistent with estimates made from M vs. H loops.

We find that the facile magnetisation direction can be rotated by 90° with the application of an electric field only for 28 nm films deposited on PMN-PT (011). In thinner films, the magnetoelectric coefficient is too small to overcome the magnetic anisotropy. These results indicate that if magnetostrictive materials are to be applied in straintronics devices, the dependence of magnetic parameters on film thickness must be taken into account for optimal performance.

I will also give a summary of other topics we are investigating in the Magnetic Films group of the Magnetic Resonance Division – Bariloche, Argentina.

Authors: María Julia Jiménez, Livio Leiva, J.L. Ampuero Torres, G. Cabeza, J.E. Gómez, D. Velázquez Rodriguez, J. Milano, and A. Butera (presenter) from Laboratory of Magnetic Resonance Imaging, Bariloche Atomic Centre and Balseiro Institute, Bariloche, Argentina.

Vanina Gisela Franco from CONICET Argentina presents her work about thermoelectric material prepared from natural pyrite

Iberian Thermoelectric Workshop – ITW ’23 Lisbon was hosted at Campus Tecnológico e Nuclear of IST-UL, Lisbon, from March 30-31 2023. The conference aims to provide opportunities to improve the collaboration between researchers and specialists in the thermoelectricity field and also allow an open discussion about the most recent advances in materials, properties measurement, module fabrication, and device applications.

Dra. Vanina Gisela Franco from Instituto de Física del Litoral IFIS-CONICET, Santa Fe, Argentina used her secondment to the University of Zaragoza to present her work on this exciting topic done in the scope of the ULTIMATE I project.

Alejandro Butera from CNEA Magnetic Resonance Laboratory secondment to the University of Zaragoza

Alejandro Butera, CONICET professor and researcher of CNEA Magnetic Resonance Laboratory, from the Instituto Balseiro de San Carlos de Bariloche-Argentina is visiting the Advanced Microscopy Laboratory (LMA) of the University of Zaragoza-Spain (UNIZAR) and Aragón Materials Science Institute (ICMA).

During his stay, he will study FeCo and permalloy samples prepared by focused ion beam (FIB) and use transmission electron microscope (TEM) analysis by Titan TEM.

Alejandro Butera and Teobaldo Torres are in pictures preparing to enter the Clean Room for using the Dual Beam 650 and lamellae preparation.

Secondment to Senzor Infiz and participation at the annual conference of the German Physical Society

ULTIMATE-I secondment to Senzor Infiz of Sindy J. Rodríguez Sotelo (Instituto de Física del Litoral IFIS-CONICET, Santa Fe, Argentina).

The secondment was used to explore interactions directing the self-assembly of magnetic nanocubes and prepare the publication with Carlos Garcia (CCTVal, Universidad Técnica Federico Santa María, Valparaíso, Chile). Also, a prolonged stay in Senzor Infiz was used to discuss the modelling of production processes, particularly the exfoliation of two-dimensional materials.

The results of the secondment are presented at the German Physical Society annual conference from 26 March to 31 March 2023 on the campus of the Technical University Dresden. The conference was organized by the Condensed Matter Section of the society.

  • Sindy Rodríguez (CONICET); oral presentation: “Formation model of AlF3 intercalated aggregates on HOPG surfaces for rechargeable battery applications”; authors: S.J. Rodríguez, I. Stanković, A.E. Candia, M.C.G. Passeggi and G.Ruano
  • Sindy Rodríguez (CONICET); poster presentation: “Assembly of iron oxide nanocuboids directed by surface, ligand and magnetic interactions”

Magnetic Nanodevices for Spintronic And Neuromorphic Applications (OFFER, PhD position)

Project description:
Magnetic nanodevices display a wide variety of behaviours that resemble the properties of both neurons and synapses. Neuromorphic computing takes inspiration from the way the brain processes data to improve energy efficiency and computational power. For the development of these magnetic nanodevices, including spin-orbit torque memories (SOT-MRAM), magnetic SOT oscillators and resistance-switching-based memories, optimization of materials and interfaces is required. The project involves the fabrication and characterization of magnonic and spintronic heterostructures for application in magnetic nanodevices.

From the point of view of materials science, basic studies of materials in large facilities will be carried out and from the applied point of view, systems with optimized properties of resistivity, generation/detection of spin currents and SOT efficiency will be worked on.

Deadline (reception of applications): April 15, 2023

Applicants should submit a CV, a list of publications, and a list of possible references to Dr. M. A. Laguna Marco ( and Dr. Myriam H. Aguirre (

Main Tasks:

  • Synthesis and optimization of thin-film nanomaterials. Manufacture of devices by lithography in a clean room: magnetic and electrical memories, oscillators.
  • Conducting experiments on novel quantum materials
  • Structural characterization (performing XRR, XRD, and TEM Microscopy experiments), electrical and magnetic characterization.
  • Electrical and thermomagnetic transport measurements.
  • Analysis of data.
  • Preparation of reports and scientific articles and presentation of results at scientific conferences

    Qualifications/Skills: Applicants should have a Master in Physics, Materials Science, Chemistry, Eng. or related fields. Priority will be given to candidates with a demonstrated background in standard fabrication techniques, and characterization of magnetic/spintronic materials.

    The candidate should have excellent written and oral communication skills in English.

Research Profile: PhD student
Research Field: Magnetic Nanodevices for Spintronic And
Neuromorphic Applications
Location: Zaragoza (Spain)

Time of Contract: 2 (CSIC) + 2 (University of Zaragoza) years