The talk is intended to welcome all the participants to Bilbao and to the University of the Basque Country (UPV/EHU). Further, the main investigation lines of the group lead by F. Plazaola will be presented, along with the latest results obtained in Hyperthermia, Shape Memory Alloys, Mössbauer spectroscopy and Positron Annihilation Lifetime Spectroscopy.
Solid state Physics research at ISOLDE (CERN) has been running since the mid-1970s and accounts for about 10-15% of the overall physics programme. ISOLDE is the world flagship for the on-line production of exotic radioactive isotopes, with high yields, high elemental selectivity and isotopic purity. Consequently, it hosts a wide variety of state-of-the-art nuclear techniques which apply...
The idea that “new-is-small” reflects a paradigm moving industries and research. New materials, new applications, new technologies, - but what do we need to make the “new”, understandable, applicable and reliable? Clearly, as things go smaller and smaller, it is more difficult to probe at the appropriate scale without influencing the subject of interest. Ideally, one needs tip-less...
I will give a quick overveiw of the facilities available
An overview of the beam-time will be given focusing on the status of measurements, equipment and challenges.
An overview of results from the binary system will be given and the differences observed in their corresponding spectra that paved a way for studying the ternary system will be highlighted.
The spectra for Fe implanted AlGaN show the presence of magnetically-split sextets in the “wings”, similar to features observed in GaN and AlN, attributed to Fe3+ on Al/Ga sites showing slow paramagnetic relaxations. The central part of the spectra is characterised by paramagnetic Fe2+ on Al/Ga sites associated with nitrogen vacancies. However, with Mn doping, the contribution of Fe3+ is...
Irradiating with charged particles can result in the build-up of a net charge in the irradiated material if the range of the particles is shorter than the shortest dimension of the material. This results in a net stored charge in the material, and may ultimately lead to charge break-down. The phenomenon is often observed in insulators or wide-band gap semi-conductor materials (e.g. Blaise and...
I will talk about the semi-emperical model ...
TiN thin films are interesting gate materials in future non-Si based metal-oxide semiconductor devices. TiN has also been experimentally confirmed with strong surface plasmon resonance at the near infrared spectral range. In water splitting experiments, TiN nanoparticles were found to outperform Au nanoparticles in the enhancing photocurrent under solar irradiation. However, the performance...
Chemical experiments with Mn-57 at ISOLDE CERN
Dedushenko S., Gunnlaugsson H., Larsen E., Olafsson S., Johnston K., Masenda H., Peters G., Schell J., Unzueta Solozabal I., Yablokov M., Zyabkin D., Bendix J., Bharuth-Ram K., Gisslasson H., Hemmingsen L., Krastev P., Langouche G., Mantovan R., Naidoo D., Perfiliev Yu., Qi B., ISOLDE Collaboration
EMS is an important method...
I will talk about the results obtained in NaCl in Mn18. A single line is observed that can be interpreted as due to singly charged Fe in S=1/2 spin state
The integration of ferromagnetic thin films (FM) with the classes of two dimensional (2D) transition metal dichalcogenides (TMD) and topological insulators (TI) constitutes a very promising route to build-up the next generation of spintronic devices . In particular, the use of TMD and TI can boost the efficiency of the spin orbit torque exerted to an adjacent FM layer, by taking advantage...
Among transition-metal oxides, the Molybdenum oxide compounds are particularly attractive due to the structural (2D) anisotropy and to the ability of the molybdenum ion to change its oxidation state, being such properties well adequate for applications on, e.g., chemical sensors, solar cells, catalytic and optoelectronic devices. At ISOLDE we aim studying the incorporation of selected dopants...
We report the angular dependence of the 2-dimensional α-MoO3 single crystals by emission Mössbauer Spectroscopy (eMS) via ion implantation via of 57Mn (t1/2 = 1.5 min) carried out at ISOLDE-CERN. In addition, scanning electron microscope analysis was carried out at room temperature.
Results obtained during the eMS beam time in 2017 on hydrogenated anatse titania. Spectra have shown an interesting behaviour, which turned out to be different in comparision to pristine samples.
Mn-based Alloys are characterized by a wealth of properties, which are of interest both from fundamental physics point of view and particularly attractive for different applications in modern technology. In order to uncover new routes towards the optimization of the properties of these materials, it is crucial to establish a direct correlation between macro- and micro-scaled...
The talk will be focused on the results of Si-implanted MnSi alloys and particularly on SQUID results.
A comparison between eMS and CEMS will be presented in e-FeSi thin film and single crystals.
An overview of the eMS measurements (119In / Sn and 57Mn / Fe) carried out in MnxGa (x = 0.7, 0.8, 1.1, 1.4, 1.9) alloys (2014-2018) is presented. The most relevant results obtained from the data fitting will be highlighted. In the final part of the talk, a time for a quick discussion on the interpretation of the results will be given.
There are remaining shifts, particularly 119In shifts, which will help on the interpretation of the local magnetism in MnxGa alloys.
The eMS and CEMS on (virtually) room-T ferromagnetic FeGe single crystal will be exposed and discussed in this talk.
57Fe emission Mössbauer measurements, carried out on virgin and annealed Fe76Mo8Cu1B15 nano-crystalline samples are presented in this talk. The discussion is focused on the role of the implantation-induced damage, and its effect on the atomic-scale magnetism.
I will give an overview of the results obtained in LiF from 2018. Fe is observed at Fe1+ S=1/2 as in NaCl and additionally as Fe2+, presumably in low spin configuration
I will describe the results obtained in di-fluorides from Mn18
I will briefly describe the status on "quenching". A manusrcript is ready but needs feedback
Metal to Insulator-to-transitions (MIT) driven by electronic interactions in strongly correlated materials are among the most remarkable phenomena in condensed matter physics. It has been found important applications in the next-generation so-called “beyond silicon” electronics and neuromorphic devices. Vanadium sesquioxide V2O3 is a prototypical Mott insulator, which undergoes the MIT between...
VO2 shares the similar metal-insulator transitions (MIT) and structural phase transition properties as the V2O3 and found equally important applications in Mott memory and neuromorphic devices, which surpass the limitations of conventional electronics. In contrast, MIT occurs at much higher temperature (340 K) in VO2 that that (160 K) in V2O3. Furthermore, the MIT of VO2 is much more robust...
Bismuth Ferrite is the best studied room temperature multiferroic due to its potential applications as magnetoelectric memory and in magnetic sensing. Its magnetic order is a result of spin moment coupling of the iron ions. A modified G-type antiferromagnetism yields an effectively vanishing gross magnetization. Magnetic order in Bismuth Ferrite becomes intricate due to the formation of the...
I will briefly tell about the status of a STO paper
Synthetic crystalline garnets doped with the rare-earth elements are commonly used as a host materials in acoustic transmitters and numerous nonlinear optics applications because of their ability to generate ultra short pulses. 57Fe emission Mössbauer spectroscopy (eMS) following implantation of 57Mn (T½ = 1.5 min.) in the temperature range from 298 K to 798 K has been applied to study the...
The SPES project at the Laboratori di Legnaro of INFN (Italy), currently in the construction phase, consists of a new cyclotron accelerator delivering high intensity, up to 70 MeV proton beams. The beam impinges on an ISOL target for the production of a variety of radioactive nuclei for nuclear physics experiment.
Its target-ion source complex represents the core of an ISOL facility. In...
A look at the new setup for eMS experiments.
Talks over new ways how to perform advanced experiments by virtue of eMIL such as: advanced magnetic, cryogenic measuraments as well as measurament od electroconductivity and experiments performed under pressure in-situ.
On the progress in automation of the chemical experiments with Mn-57
at ISOLDE CERN
Yu.K.Belov, S.K.Dedushenko, D.M.Levin, M.G.Tsepkov
Mössbauer Collaboration Team
First wet-chemical experiments with Mn-57 were conducted at ISOLDE in June 2017. They comprised multiple steps: placement of a piece of metallic foil (target) in the implantation chamber...
We have few high energy shifts (I161), what to do with them?
I will talk about possibiliites of making a proposal on Halides and Fluorides
Magnetoelectric coupling exists locally but is not observable macroscopically due to the antiferromagnetic order. We aim to submit a project to the INTC-CERN in order to use emission Mössbauer spectroscopy to study magnetoelectric coupling and the effect of implantation process in bismuth ferrite.
Possible studies related to new candidates considered to be alternatives to rare-earth-based hard magnetic materials. Several possible directions are going to be presented, studies can be done on basis of thin films.
Things that need to be addressed:
- Publication rules
- Group structure
- FTP/WEB etc
Things that need to be addressed:
- Publication rules
- Group structure
- FTP/WEB etc
One of the main conclusions obtained by ion-implanting and subsequent eMS measurements in Ni-based Heusler alloys performed at ISOLDE, is that the implantation damage destroys the local magnetism. eMS measurements are compared with transmission 119Sn Mössbauer measurements, where a clear influence of the implantation damage is observed.