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Tag: 2023

Enhanced spin current transmissivity in Pt/CoFe2O4 bilayers with thermally induced interfacial magnetic modification

Written by Palma Scarcia on . Posted in FEATURED, News.

M. Gamino, A. B. Oliveira, D. S. Maior, P. R. T. Ribeiro, F. L. A. Machado, T. J. A. Mori, M. A. Correa, F. Bohn, R. L. Rodríguez-Suárez, J. Fontcuberta, and S. M. Rezende

Phys. Rev. B 2023, 108, 224402;

DOI: https://doi.org/10.1103/PhysRevB.108.224402

Abstract

We report on processes of generation of spin current and conversion into charge current in CoFe2O4/Pt bilayers by means of spin Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) experiments. Specifically, we explore (001) full-textured CoFe2O4 (CFO) thin films grown onto (001)-oriented SrTiO3 substrates, covered with Pt layers deposited under two different conditions: one at room temperature and another at high temperature (400∘C). The x-ray absorption spectroscopy measurements indicate that the Pt layer deposited at high temperature induces an interfacial magneticlike phase (Fe,Co)-Pt alloy, which influences the magnetic behavior of the structure and is responsible for the enhancement of the spin transmission at the interface. By analyzing the SMR data, we conclude that collinear and noncollinear magnetic domains coexist at the CFO-(Fe,Co)-Pt interface. By combining the data from the SMR and SSE measurements, we obtain the ratios between the values of the spin Hall angle (θSH) and between the ones of the spin-mixing conductance (g↑↓eff) in the two samples. We demonstrate that while the value of θSH decreases by one-half with the heat treatment, the value of g↑↓eff increases by more than one order of magnitude. We interpret the increase of g↑↓eff in terms of unexpected magnetic reconstructions, which produce an enhancement of the magnetic moment arisen at the interface. Since the spin-mixing conductance determines the efficiency of the spin current transmission through the interface, the spinel ferrite cobalt in contact with a normal metal with a suitable heat treatment becomes a promising material for spintronics device applications.

Orbital Currents School 2023

Written by Palma Scarcia on . Posted in FEATURED, News.

The ICMAB organized Orbital Currents School 2023 conclued. 

With a participation of about 70 attendants in-person and 110 on line, the School has finished. A very exciting Introductory lecture by Tatiana G. Rappoport, was followed by lectures by Aurélien Manchon, Dongwook Go, Enric Canadell, Hyun-Woo Lee and Can Onur Avci, which motivated living discussions, comments and suggested intriguing prospectives.

Emanuele joins the lab as postdoc to work on “Orbital currents in early transition metals metallic oxides”

Written by Palma Scarcia on . Posted in News.

During his PhD and previous postdoc, Dr. Longo studied the chemical-physical interactions between an exotic phase of matter known as “topological insulator” and ferromagnetic materials, with the aim to produce efficient spintronic devices for memory storage and logic applications. In MULFOX, Dr .Longo studies the detection, and characterization of orbital currents in early transition metals metallic oxides, activity which lies in the framework of the so-called “spinorbitronics”. The possibility to use light materials and their exceptional transport properties make the orbital currents very promising to be exploited in the future micro- and nano- electronic devices.

Yingjie Zhu joins the lab as PhD student

Written by Palma Scarcia on . Posted in News.

Yingjie Zhu joins the lab as PhD student to work on “Spin-orbit-entangleement in Jahn-Teller Systems”. 

Yingjie Zhu, comes from China. She did her master’s research in Materials Science and Engineering. She joins the lab to pursue a PhD in Light-matter interactions, the objective is to explore spin-orbit entanglement in Jahn-Teller correlated systems. Yingjie Zhu loves Chinese poetry”

Jiahui Jia’s PhD Thesis

Written by Palma Scarcia on . Posted in News.

Jiahui Jia’s Thesis investigates ways to manipulate the structural realizations of materials with external fields, allowing for dynamic tuning of their properties. The focus is on altering lattice distortions, particularly octahedral rotations, to modify their characteristics. Attention is paid to magnetism, including antiferromagnetic order and spin canting. Using DFT, Jiahui Jia has discovered various techniques for manipulating lattice distortions and establish a comprehensive connection between these distortions and the ensuing magnetism. These findings provide a route for designing structures with adjustable magnetic properties, which can contribute to the development of sophisticated materials with tailored functionalities. 

The supervisors of this Thesis are Miguel Pruneda, from Nanomaterials and Nanotechnology Research Center (CINN-CSIC) and  Gervasi Herranz, from MULFOX, ICMAB-CSIC

Rubén García Llorente joins the lab with a JAE Intro

Written by Palma Scarcia on . Posted in News.

Rubén is currently studying a master’s degree in theoretical particle physics and cosmology at the Universitat de Barcelona. He combines his studies with an introductory research grant JAE INTRO in our group, to work in the area of Quantum transport and light-matter interactions, using manybody physics approach. He studies spin-orbit entanglement in correlated systems based on Mn3+ ions.

High-Temperature Synthesis of Ferromagnetic Eu3Ta3(O,N)9 with a Triple Perovskite Structure

Written by Palma Scarcia on . Posted in News.

Jhonatan R. Guarín, Carlos Frontera, Judith Oró-Solé, Jaume Gàzquez, Clemens Ritter, Josep Fontcuberta*, and Amparo Fuertes

Inorg. Chem. 2023, 62, 42, 17362–17370;

DOI: https://doi.org/10.1021/acs.inorgchem.3c02691

Abstract

Europium tantalum perovskite oxynitrides were prepared by a new high-temperature solid-state synthesis under N2 or N2/H2 gas. The nitrogen stoichiometry was tuned from 0.63 to 1.78 atoms per Eu or Ta atom, starting with appropriate N/O ratios in the mixture of the reactants Eu2O3, EuN and Ta3N5, or Eu2O3 and TaON, which was treated at 1200 °C for 3 h. Two phases were isolated with compositions EuTaO2.37N0.63 and Eu3Ta3O3.66N5.34, showing different crystal structures and magnetic properties.

Electron diffraction and Rietveld refinement of synchrotron radiation X-ray diffraction indicated that EuTaO2.37N0.63 is a simple perovskite with cubic Pm3̅m structure and cell parameter a = 4.02043(1) Å, whereas the new compound Eu3Ta3O3.66N5.34 is the first example of a triple perovskite oxynitride and shows space group P4/mmm with crystal parameters a = 3.99610(2), c = 11.96238(9) Å. The tripling of the c-axis in this phase is a consequence of the partial ordering of europium atoms with different charges in two A sites of the perovskite structure with relative ratio 2:1, where the formal oxidation states +3 and +2 are respectively dominant. Magnetic data provide evidence of ferromagnetic ordering developing at low temperatures in both oxynitrides, with saturation magnetization of about 6 μB and 3 μB per Eu ion for EuTaO2.37N0.63 and the triple perovskite Eu3Ta3O3.66N5.34 respectively, and corresponding Curie temperatures of about 7 and 3 K, which is in agreement with the lower proportion of Eu2+ in the latter compound.

Janine Gückelhorn joins as postdoc to research on two-dimensional electron gases at quantum paraelectric interfaces

Written by Palma Scarcia on . Posted in News.

Janine Gückelhorn has developed his Ph.D at the Walther-Meissner-Institute, Bavarian Academy of Sciences and Humanities in Germany. Her research is focused on Magnetism and Spintronics and, in particular, Spin Currents and Magnon Transport. He works at ICMAB on two-dimensional electron gases on quantum paraelectric interfaces.

Talk “Spin-orbit mixing in Mn3+ driven by Jahn-Teller and spin-orbit interactions” at the International Workshop on Oxide Electronics WOE29, Busan, South Korea, 18th October 2023

Written by Palma Scarcia on . Posted in News.

Gervasi Herranz has delivered a talk on “Spin-orbit mixing in Mn3+ driven by Jahn-Teller and spin-orbit interactions ” at the 29th International Workshop on Oxide Electrons, Busan, Republic of Korea. In the talk, Gervasi Herranz explained the latest results on our research on spin-orbit entangled states in Mn3+ systems, using electromagnetic fields to probe and manipulate these states.

Gervasi Herranz participate at the APS March Meeting

Written by JAGS on . Posted in News.

Gervasi Herranz delivers on 8th of March a talk at the APS March Meeting (Las Vegas, Nevada, USA)in focus session : The talk is entitled “(N38) Spin-orbit mixed states in an electromagnetic field” in FOCUS SESSION “Light Induced Structural Control of Electronic Phases III”.

2023

Written by JAGS on . Posted in Conferences.

INVITED TALKS

Electron-phonon vs electron-electron correlations in early-transition metal conducting oxides
Josep Fontcuberta
The 13th International Conference on Advanced Materials and Devices ICAMD 2023
Dec. 4-8, 2023, Jeju, Korea

Growth, optimization, and electrical manipulation of rare-earth iron garnets for efficient spintronics
Can Onur Avci
JEMS2023 Joint European Magnetic Symposia
Aug. 28- Sep 02, 2023, Madrid, Spain.

Growth, optimization, and electrical manipulation of rare-earth iron garnets for efficient spintronics
Can Onur Avci
SPIE Spintronics-XVI
Aug. 20-24, 2023, San Diego, USA

Growth, optimization, and electrical manipulation of rare-earth iron garnets for spintronic applications
Can Onur Avci
IEEE International Magnetics Conference INTERMAG 2023
May. 15-19, 2023, Sendai, Japan

Rare-earth iron garnets with perpendicular magnetic anisotropy for efficient spintronics
Can Onur Avci
8th International Conference on Superconductivity and Magnetism (ICSM2023)
May 4-11 2023, Fethiye Turkey

REGULAR TALKS

Spin-orbit mixed states in an electromagnetic field
Gervasi Herranz
APS March Meeting
Las Vegas, Nevada, USA, 2023

Electron-phonon and spin-orbit coupling in early-transition metal conductive oxides
Josep Fontcuberta
APS March Meeting
Las Vegas, Nevada, USA, 2023

2023

Written by JAGS on . Posted in Publications.

Enhanced spin current transmissivity in Pt/CoFe2O4 bilayers with thermally induced interfacial magnetic modification
M. Gamino, A. B. Oliveira, D. S. Maior, P. R. T. Ribeiro, F. L. A. Machado, T. J. A. Mori, M. A. Correa, F. Bohn, R. L. Rodríguez-Suárez, J. Fontcuberta, and S. M. Rezende.
Phys. Rev. B. 2023 108, 224402

High-Temperature Synthesis of Ferromagnetic Eu3Ta3(O,N)9 with a Triple Perovskite Structure
Jhonatan R. Guarín, Carlos Frontera, Judith Oró-Solé, Jaume Gàzquez, Clemens Ritter, Josep Fontcuberta*, and Amparo Fuertes.
Inorg. Chem. 2023, 62, 42, 17362–17370

Band Alignment and Photoresponse of LaFeO3-Based Heterojunctions
Yunwei Sheng, Mathieu Mirjolet, Mario Villa, Jaume Gàzquez, José Santiso, Andreas Klein, Jordi Fraxedas, and Josep Fontcuberta.
Phys. Rev. Applied 19, 024001 (2023)

Sputtered terbium iron garnet films with perpendicular magnetic anisotropy for spintronic applications
S. Damerio, and C. O. Avci,
J. Appl. Phys. 133, 073902 (2023)

Leveraging symmetry for an accurate spin-orbit torques characterization in ferrimagnetic insulators
M. Testa-Anta, C.-H. Lambert, and C. O. Avci, 
Adv. Electron. Mater. (2023) in press

A transversal approach to predict surface charge compensation in piezoelectric force microscopy
Huan Tan, Jike Lyu, Yunwei Sheng, Pamela Machado, Tingfeng Song, Akash Bhatnagar, Mariona Coll, Florencio Sánchez, Josep Fontcuberta, Ignasi Fina  
Applied Surface Science, 607, 154991, 2023

Untwining polar contributions from light-polarization dependent photovoltaic response of LuMnO3-based ferroelectric capacitors
Yunwei Sheng, Huan Tan, Alberto Quintana, Mario Villa, Jaume Gázquez, Ignasi Fina, Josep Fontcuberta
Acta Materialia, 245, 118601, 2023

Ferroelectric Electroresistance after a Breakdown in Epitaxial Hf0.5Zr0.5O2 Tunnel Junctions
Xiao Long, Huan Tan, Florencio Sánchez, Ignasi Fina*, and Josep Fontcuberta
ACS Appl. Electron. Mater. 2023, 5, 2, 740–747 (2023)

Leo Salgado Chane-Pane

Written by JAGS on . Posted in Former Members.

Leo Salgado Chane-Pane joined ICMAB-CSIC and the MAGNEPIC project in November 2021. He studied Chemistry at the University of Santiago (Spain), where he obtained his BSc. in 2020. He is currently an MSc. student at the Autonomous University of Barcelona, specializing in Advanced Nanoscience and Nanotechnology. Leo is carrying out his thesis project on current-controlled ferroelectric devices for next-generation nonvolatile data storage.

Email: lsalgado@icmab.es

Teodor Parella Dilmé

Written by JAGS on . Posted in Former Members.

Teodor Parella Dilmé joined ICMAB-CSIC and the MAGNEPIC project as a JAE Intro fellow in October 2021. He is a double degree B.Sc. student in physics and chemistry at the Autonomous University of Barcelona. Teo is currently undertaking his bachelor thesis in physics and his research focuses on ionic control of spin-orbit torques in ferrimagnetic insulators.

Email: tparella@icmab.es

Martín Testa Anta

Written by JAGS on . Posted in Former Members.

Martín Testa Anta joined ICMAB-CSIC and the MAGNEPIC project as a PhD student in March 2021. He obtained his BSc(Hons) (2015) and MSc (2016) in Chemistry from the University of Vigo (Spain). He subsequently joined the Applied Physics Department at the same university as a predoctoral fellow, where he worked on the synthesis and characterization of magnetic nanocrystals, with particular emphasis on the phenomena that take place at the surface and interfaces between transition metal oxides. His current research is focused on the spin-torque control of magnetization in ferrimagnetic insulators. 

Email: mtesta@icmab.es

Xiao Long

Written by JAGS on . Posted in Former Members.

Xiao Long joints our team and initiate their PhD work on October 5th, 2018. Welcome!

Hello, I am Xiao Long, from Shanghai University. Now I have joined the group of Multifunctional Oxides and Complex Structures to do my PhD work on ferroelectric films.
See you around!