Scientific divisions

Research



Goals

The main scientific goal is to utilize selforganisation effect in order to fabricate new materials based on the highly ordered arrays of nanoparticles (mainly Fe, Co and Ni). Subsequently, to explore their catalytic, and more importantly, electron and magnetic properties. The examination of the properties, resulting from a selforganisation process of the nanodots or nanorods, will enable a deep insight into the physics of the low-dimensional systems: micromagnetism of the magnetic domains and domain walls, magnetic anisotropy at a zero and one dimensional systems. Additionally, MBE-fabricated systems may be utilized in e. g. nanoelectronics, catalysis and magnetic memories

Scientific profile

Preparation of the ultrathin films of metal oxides and metal-oxide nanostructures, ultrathin films and magnetic multilayers with the PVD techniques in the UHV conditions. Conducting the measurements of different physical properties and structural examination with the use of STM, LEED, RHEED techniques. The composition analysis is determined via XPS (ESCA). The examination of the metallic nanostructures originating from the selforganisation processes.

Scientific programmes

  • NCN Project - MAGNETyczne nanOstruktury tleNkowe (MAGNETON): badania eksperymentalne i teoretyczne (Magnetic Oxide Nanostructures: experimental and theoretical investigation) (2013-2016), leader - dr. M. Lewandowski
  • MNiSW Project - Wzrost i właściwości nanocząstek Au, Co i Ni na powierzchni cienkich warstw tlenków żelaza na Ru(0001) (Growth and Properties of the Au, Co and Ni Nanoparticles on the Ultrathin Iron Oxide Ffilms on Ru(0001)(2012-2015), leader - dr. M. Lewandowski
  • Main project - Nanostruktury metaliczne otrzymywane metodą samoorganizacji(Metallic nanostructers resulting from the selforganization) (2012-2015), leader - dr. hab. T. Luciński, prof. IFM PAN

Achievements

  • By perpendicular evaporation onto Ag(111) single crystal the arrays of iron nanorods and nanoislands (height of 60 nm) were fabricated
  • The structural mismatch influence on the growth and properties of the ultrathin layers of iron oxides on the single crystals Pt(111) and Ru(0001) was examined [M. Lewandowski et al., “Nanoscience Advances in CBRN Agents Detection, Information and Energy Security”, Eds. P. Petkov et al., Springer, 319 (2015)]
  • The investigation of the Moiré-type Fe and Co oxides structures, promoting the selforganization of the metallic particles (Au, Co Ni). The systems based on the ferromagnetic nanoparticles (Co and Ni) are particularly interesting due to their potential applications.   If self organized, such materials containing the arrays of magnetic nanodots or nanorods may be applied in the electronic devices (the electron transfer) or catalysis (electrically charged Au nanoparticles)
  • Chemical composition determination of the multiferroic BiFeO3 nanoflowers and the influence of the synthesis time on their composition
STM image of FeO(111)/Ru(0001)
STM image of FeO(111)/Ru(0001) (topography, 100 x 100 nm, -0.7V, 1.0 nA)

Conferences

Organized and coorganized Conferences

School on Chiral Liquid Crystals (SCHLC)
22-27 May 2005, Będlewo, near Poznań, Poland

Conferences

(Co)Organized Conferences

Equipment

Bruker ASCEND spectrometer coupled to a vertical wide-bore (89-mm) magnet operating at 11.74 T (500 MHz for 1H). The console of the spectrometer equipped with three high power radio-frequency (RF) channels of 1000, 1000, and 500 W is configured for solid-state NMR experiments. The spectrometer is provided with the following accessories:

  • 5 mm triple resonance (1H/X/Y) magic angle spinning (MAS) probe with different X/Y frequency combinations (realized with various RF inserts) including 13C, 15N, 31P, 11B, 69Ga, or 2H allows to perform high-resolution solid-state NMR experiments in the temperature range from -70 to 80 °C.
  • 4 mm double resonance (X/Y) MAS probe covered the frequency range of 15N - 31P allows to perform high-resolution solid-state NMR experiments in the temperature range from -120 to 150 °
  • low-temperature wideline probe with four coils (10 mm for 15N, 5 mm and 10 mm for 2H - 139La, and 5 mm for 59Co - 69Ga) allows to perform static NMR experiments down to 7 K.
  • gradient system and diffusion probe with two coils of 5 mm diameter dedicated to 1H and 2H allow to perform pulse field gradient (PFG) NMR diffusion experiments using maximal gradient strength in z direction of 3000 G/cm.
  • additional equipment like high-pressure lines with nitrogen gas or dry air, heat exchangers, nitrogen evaporator, efficient gas refrigerator, dewars, pumps, etc. allow to obtain a broad range of experimental temperature conditions.

Bruker AVANCE spectrometer coupled to a vertical wide-bore (90-mm) magnet operating at 7.046 T (300 MHz for 1H). Special accessories like a gradient system, microimaging probehead, and the sophisticated imaging package allowed to performed the NMR imaging. The maximal gradient strength in x, y and z direction is 100 G/cm. The probehead for protons has four interchangeable coils of the diameter 5, 10, 15 and 25 mm. For small samples 1H imaging with 2D resolution of about 10 µm are obtained in our laboratory. The Para Vision software supports a variety of special processing functions including statistical analysis in regions of interest and 3D surface reconstruction. The following imaging methods are performed on our spectrometer:

  • Gradient Echo Fast Imaging (GEFI)
  • Multislice/Multiecho (MSME), T2 calculations
  • Snapshot FLASH Method
  • Contrast imaging
  • Diffusion imaging (SEDIFFUSION, STEDIFFUSION)
  • Constant time/ single point imaging (CTI/SPI)
  • Localized spectroscopy (VOSY,VSEL)
  • Chemical shift imaging (CSIND)



SPINMASTER FFC2000 (the fast Field Cycling NMR relaxometer) is a unique NMR instrument designed to measure the field dependence of NMR spin-lattice and spin-spin relaxation time T1 and T2 (Nuclear Magnetic Relaxation Dispersion profiles) from 10 kHz to 40 MHz (1H Larmor frequency).

The system consist of the following units: 1 Tesla wide-bore electromagnet, double circuit magnet/power supply cooling system; 3 NMR probes working in different frequency range; variable temperature controller system for sample temperature control with 0.1 °C precision in the range of - 120 to + 140 °C; local magnetic field compensation system for low Field Relaxometry and Personal NMR Console with Software package: AcqNMR32.

Spinmaster FFC2000

The compact model of SPINMASTER FFC2000 with the electromagnet. The switching time between the polarization, relaxation and detection magnetic field can be 1 ms.

Staff

Head of group

The group

Notable former group members

  • Prof. Dr. hab. Stefan Waplak

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