— 9 July 2020 —
Plenary Talk @ ICNMSME-2020
On 9 July 2020, as an outreach activity to disseminate the Project, SPINMULTIFILM Coordinator Nikolai Sobolev held a plenary talk entitled Ion beam modification of magnetic anisotropy, interlayer coupling and tunnel magnetoresistance in magnetic tunnel junctions at the ICNMSME-2020 – 3rd International Conference on Nanomaterials Science and Mechanical Engineering (7-10 July 2020, Aveiro, Portugal).
— 7 February 2020 —
Seminar @ Institute for Solid State Physics – Friedrich Schiller University Jena, Germany
On 7 February 2020, as an outreach activity to disseminate the Project, Coordinator Nikolai Sobolev held a seminar entitled Ion irradiation in the technology of perpendicular magnetic tunnel junctions at the Institute for Solid State Physics – Friedrich Schiller University Jena (IFK-FSU) in Jena, Germany.
— 23 October 2019 —
Seminar @ National University of Science and Technology “MISiS”, Russia
On 23 October 2019, as an outreach activity to disseminate the Project, SPINMULTIFILM Coordinator Nikolai Sobolev presented a talk entitled Physics and Technology of Magnetic Heterostructures: magnetic tunnel junctions with easy-cone anisotropy during a scientific seminar at the National University of Science and Technology “MISiS” in Moscow, Russia.
— 21 October 2019 —
Plenary Talk @ MMMSEC-2019
On 21 October 2019, as an outreach activity to disseminate the Project, SPINMULTIFILM Coordinator Nikolai Sobolev held a plenary talk entitled Perpendicular magnetic tunnel junctions with a dual-FeCoB/MgO-interfaced storage-layer: parameter extraction and modeling at the MMMSEC-2019 – Mathematical Modeling in Materials Science of Electronic Components, I International Conference (21-23 October 2019, Moscow, Russia).
— 9 September 2019 —
Seminar @ National Academy of Sciences, Belarus
On 9 September 2019, within the scope of the SPINMULTIFILM project, Prof. Dr. Gunnar Suchaneck (TUD, Germany) held a seminar entitled Synthesis of thin films of multicomponent oxides by reactive magnetron sputtering at the National Academy of Sciences of Belarus, in Minsk, Belarus.
After the seminar, a meeting was held in order to update the collaboration plan and discuss future activities between 4 project Partners: the University of Aveiro; the Technische Universitaet Dresden; the Institute of Magnetism of the National Academy of Sciences of Ukraine and the Ministry of Education and Science of Ukraine; the Scientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus. Representing each Partner were Project Coordinator Nikolai Sobolev (UAVR), Prof. Dr. Gunnar Suchaneck (TUD), Dr. Andrii Korostil (IMAG), Dr. Mikalai Kalanda (BAS) and Dr. Sergey Demyanov (BAS).
(left to right: Sergey Demyanov, Gunnar Suchaneck, Andrii Korostil, Nikolai Sobolev, Mikalai Kalanda)
— 3-7 June 2019 —
Visit @ University of Aveiro
Prof. Nikolai Sobolev’s research group received a visit from Prof. Dr. Alexander Polyakov, Head of the laboratory “Wide-Bandgap Semiconductors and Devices” and a professor at the Department of Semiconductor Electronics and Physics of Semiconductors of the National University of Science and Technology “MISiS” in Moscow, Russia.
Prof. Dr. Polyakov held two talks regarding his work: the first, presented at the Instituto de Telecomunicações – Pólo de Aveiro, was entitled Defects responsible for the performance of GaN-based devices: LEDs, HEMTs and the second, presented at the Physics Department of the University of Aveiro, was entitled Studies of defects in ß- and a-polytypes of Ga2O3: deep electron and hole traps, luminescence, lifetimes.
— 23 May 2019 —
Seminar @ National Academy of Sciences, Belarus
On 23 May 2019, within the scope of the SPINMULTIFILM project, Prof. Sigitas Tamulevicius (KTU, Lithuania) held a seminar entitled Micro and Nanotechnologies at the Institute of Materials Science – potential for SPINMULTIFILM project at the National Academy of Sciences of Belarus, in Minsk, Belarus.
— 15-17 April 2019 —
IWAMO 2019 – International Workshop on Advanced Magnetic Oxides
From 15-17 April 2019 the city of Aveiro, Portugal, welcomed the IWAMO 2019 – International Workshop on Advanced Magnetic Oxides (iwamo2019.web.ua.pt). Hosted by the University of Aveiro, in a joint organisation with the Physics Department of the University of Aveiro and the Associate Laboratory i3N/FSCOSD ‐ Institute of Nanostructures, Nanomodelling and Nanofabrication (Aveiro unit), the Workshop was an outstanding opportunity to acquire new knowledge and exchange ideas on state‐of‐the‐art research and the latest advancements regarding magnetic oxides. The topics addressed were:
A. Theory and modelling
B. Single crystals, thin films, nanoparticles, 2D systems – growth and structure, doping
C. Perovskites and double perovskites, diluted magnetic oxides, other functional materials
D. Composites, heterostructures and interfaces
E. Novel characterization techniques and equipment
F. Magnetic resonance, including imaging
G. Nanofluids, biomedical applications
I. New trends and applications in magnetocalorics, photocatalysis, magnonics, multiferroics
13 Keynote talks, 25 Oral presentations and 13 Poster presentations were made during the event, ensuring a total of 50 participants from 16 countries. Authors that presented their work at IWAMO 2019 were invited to contribute an Original Paper or Feature Article that was published (after double reviewing) in a special issue/topical section (no proceedings) entitled Advanced Magnetic Oxides in physica status solidi (b) (Wiley-VCH).
IWAMO 2019 group photo
IWAMO 2019 was a networking event included in the annual planning framework for Project SPINMULTIFILM. A mid-term meeting with representatives from all Beneficiaries/Partners took place during the event in order to analyse the progress achieved to the date, exchange experience and plan further activities.
IWAMO 2019 mid-term meeting
— 12 December 2018 —
Lecture @ National University of Science and Technology “MISiS”, Russia
On 12 December 2018, as an outreach activity to disseminate the Project, SPINMULTIFILM Coordinator Nikolai Sobolev held a lecture entitled Magnetic memory – quo vadis? at the National University of Science and Technology “MISiS” in Moscow, Russia. The full presentation is available at https://vk.com/nust_misis?w=wall-62258607_16308
— 22-23 October 2018 —
As an outreach activity to disseminate the Project, SPINMULTIFILM Coordinator Nikolai Sobolev made invited presentations of his talk Radiation technology of perpendicular magnetic tunnel junctions at two paramount research institutes: on 22 October at the Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena, Germany, and on 23 October at the Peter Grünberg Institute PGI (Group of Electronic Materials) in Aachen, Germany.
— 12 September 2018 —
Seminar @ National Academy of Sciences, Belarus
On 12 September 2018, within the scope of the SPINMULTIFILM project, a seminar was held at the National Academy of Sciences of Belarus, in Minsk, Belarus. There were four presentations made, followed by a panel discussion.
A project meeting was also held, after the seminar, in order to update the collaboration plan for all three partners (BAS, IMAG and UAVR) for the time span until the mid-term meeting in April 2019.
— 1 August 2018 —
Seminar @ Weizmann Institute of Science, Israel
On 1 August 2018, within the scope of the SPINMULTIFILM project, Coordinator Nikolai Sobolev held a seminar entitled Ion irradiation in the technology of perpendicular magnetic tunnel junctions at the Weizmann Institute of Science in Rehovot, Israel.
The magnetic properties of ultrathin magnetic films and multilayers, e.g. magnetic anisotropies and exchange coupling, strongly depend on the surface and interface structure. Chemical composition, crystallinity, grain sizes and their distribution govern the magnetic behaviour. All these structural properties can be modified by particle irradiation. Magnetic patterning without affecting the surface topography becomes feasible, which may be of interest in applications. Homogeneous ion irradiation through masks and focused ion beam and ion projection lithography can be applied for patterning. The creation of magnetic feature sizes down to a few ten nm is possible. The main areas are magnetic data storage applications, such as hard magnetic media with a large perpendicular magnetic anisotropy (PMA) or patterned media with an improved signal-to-noise ratio and magnetic sensor elements.
The PMA is very common at magnetic metal/oxide interfaces. It is thought to be a result of electronic hybridization between the oxygen and the magnetic transition metal orbit across the interface. Interest in this phenomenon appeared in 2010 when it was demonstrated that the PMA at magnetic transition metal/oxide interfaces could be used to build out-of-plane magnetized magnetic tunnel junctions (MTJ) for spin-transfer-torque magnetic random access memory (STT-MRAM) cells. In these systems, the PMA at the CoFeB/MgO interface can be used to simultaneously obtain good memory retention, thanks to the large PMA amplitude, and a low write current, thanks to a relatively weak Gilbert damping.
A short overview over the irradiation experiments aiming at a modification of magnetic and magnetoresistive properties of different layered magnetic structures was given, as well as a description in detail of recent experiments on ion irradiation of double-MgO free layers designed for application in perpendicular MTJ. The samples comprised a MgO / FeCoB / X / FeCoB / MgO layer stack, where X stands for an ultrathin (0.2 nm) Ta or W spacer. In particular, there are induced easy-cone states, with different cone angles, in thin (tFeCoB = 2.6 nm) free layers with a W spacer, initially exhibiting a uniaxial anisotropy. This easy cone only exists if K1 > 0, K2 < 0 and – K2 > 2K1, with K1 and K2 being the first- and second-order anisotropy constants. Easy-cone anisotropy may help reduce the stochasticity of the spin transfer torque switching. Importantly, no increase in the Gilbert damping after irradiation has been observed.
(left to right: Igor Lubomirsky, Nikolai Sobolev /// sculpture: Unicorn by Salvador Dali)
— 6 June 2018 —
Visit @ University of Aveiro
Prof. Nikolai Sobolev’s research group received a visit from Dr. Alexey Mikhaylov, a Head of Laboratory at the Lobachevsky Nizhny Novgorod University, Russia. Dr. Mikhaylov held a talk entitled Metal-Oxide Memristive Devices for Applications in Neuromorphic and Neurohybrid Systems at the 4th MemoCIS Training School (4-6 June 2018, Aveiro, Portugal).
EPR Laboratory @ Physics Department
(left to right: Andrey Turutin, Alexey Mikhaylov, Nikolai Sobolev, João Vidal, Bruno Teixeira, Carlos Rosário)
— 20 April 2018 —
Seminar @ University of Aveiro
On 20 April 2018, within the scope of the SPINMULTIFILM project, Prof. Dr. Gunnar Suchaneck (T. U. Dresden, Germany) held a seminar entitled Multi-target reactive sputter deposition of complex oxide thin films at the University of Aveiro. The attendees came from three Associate Laboratories: i3N, CICECO and TEMA.
Multi-target reactive sputter deposition was carried out in a LS730S sputtering system (Von Ardenne, Dresden, Germany). The computer-controlled system is equipped with a process chamber and a load-lock, both evacuated by turbomolecular pumps. The process chamber consists of up to four 200 mm metal targets, three pulsed DC and one RF (13.56 MHz) magnetrons, two stationary radiation heaters and a wafer carousel holding four 150 mm silicon wafers. Additional oxygen gas channels, which are controlled by piezoelectric valves, were introduced near the target surfaces.
In-situ crystallized PZT, PMN-PT and BZT thin films were fabricated on Pt(111)-coated Si wafers by multi-target reactive sputtering (MTRS) using up to four metallic targets. The advantage of MTRS is the possibility to control the composition of deposited thin films by process parameters like power and temperature. Each target was driven by an adapted to it power supply. Pb and Ba targets were directly connected with an RF (13.56 MHz) generator. A unit for pulsed DC (100 kHz, duty cycle ~ 50 %) and arc suppression was connected between power supply and Ti and/or Zr target. High-power-pulse sputtering (50 kHz, duty cycle 50 %) was performed by connecting a high-current switching unit between a DC power supply and the Zr or Ti target. Additional doping was carried out by uniformly arranging metal oxide pellets in the racetrack of one of the targets.
Film microstructure characterization was carried out by X-ray diffraction, AFM, and electron microscopy. Composition analysis included X-ray photoelectron spectroscopy and Rutherford back scattering. Optical properties were evaluated by spectroscopic ellipsometry in the photon energy range of 0.8 to 8.7 eV. The dielectric properties and the ferroelectric polarization were examined by measuring C-V characteristics and P-E hysteresis loops. Piezoelectric coefficients were determined by piezoresponse force microscopy.
— 18 April 2018 —
Meeting @ University of Aveiro
Peter Petrov, Andrey Berenov (both Imperial College, London, UK), Gunnar Suchaneck (T. U. Dresden, Germany) and Nikolai Sobolev (U. Aveiro, Portugal) met and discussed various aspects of collaboration in the framework of the SPINMULTIFILM project and beyond during the CICMT 2018 – 14th International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies (18-20 April 2018 – Aveiro, Portugal).
(left to right: Peter Petrov, Andrey Berenov, Gunnar Suchaneck, Nikolai Sobolev)