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Magnetic
Resonance Force Microscopy |
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Project content |
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Project content |
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Time limit 2016-1018 years. Annotation of the project Magnetic resonance force
microscopy (MRFM) is a novel, fast-developing method for the diagnostic of
magnetic and microwave properties of materials and nano-devices, which
combines the advantages of scanning probe microscopy (SPM), magnetic
resonance imaging (MRI) and methods of resonance microwave diagnostic. In the
last decade the significant progress in this field was related to the
resonance detection of magnetic moments of the individual electrons and
atomic nuclei. In Russia the MRFM method is not yet implemented. The main subject of this
project is the development of high-resolution diagnostic methods based on
magnetic resonance force microscopy for the investigation of magnetic
properties of nanosystems. The project aims at the development of the MRFM
laboratory setup and the investigation of ferromagnetic resonance (FMR),
electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR)
effects in solid-state nanostructures. The main attention will be
given to the studies of spin-wave resonances in extremely small ferromagnetic
nanosystems, as well as in complex ferromagnetic nanostructures with exotic
magnetization distributions. In particular, we plan the investigation of
multi-vortex states in elliptical nanodiscs; anti-vortex states in cross-like
particles; skyrmion state in the films with perpendicular anisotropy; domain
walls in nanowires; helical states in three-layer nanodisks; artificially
frustrated magnetic nanostructures (spin ice) on the basis of single-layer
and multilayer nanoparticles, etc. A study of the spin dynamics
of nanosystems is an actual and important task. From a practical point of
view, the development of methods for the control of spin waves spectrum and
mode composition in nanostructures opens up new approaches for
microwave-assisted recording/reading of the information and for the
organization of logical calculations. In addition, the study
of the dynamics of magnetic moments at the nanoscale have the great
importance in the development of planar elements for microwave
nanoelectronics (tunable filters, non-reciprocal elements, etc.). The application of MRFM is
particularly promising in biological and medical research. Currently, the
spatial resolution of MRI in medical centers is about 0.1 mm. The MRFM
localizes a gradient magnetic field at the scales about 10 nm, and thus have
a significantly increased spatial resolution. In the framework of this
project we plan to develop MRFM methods based on nuclear magnetic resonance
and electron paramagnetic resonance for the diagnostic of the planar highly
heterogeneous systems of complex chemical compositions and biological
structures. Thus, in general, the
implementation of this project significantly expands the capabilities for the
diagnostic of microwave properties of nano-objects. In addition, as a result
of the project the laboratory MRFM setup and corresponding techniques will be
developed for the application in the investigations of wide range of samples. Subsequently, this MRFM
development will be transferred into the small-scale production to equip
physical, chemical, biological and medical research laboratories in our
country. Expected results 1. We
aim at the development and realization of laboratory MRFM setup; testing
methods for the measurements of the FMR, NMR, EPR responses, which will allow
to realize the magnetic resonance imaging (tomography) of samples with high
spatial resolution, as well as the registration of magnetic resonance spectra
from small areas of the sample and to visualize the spatial distributions of
resonant oscillations. 2. We
aim at the studies of the FMR in extremely small ferromagnetic nanosystems,
as well as in complex ferromagnetic nanostructures with exotic magnetization
distributions. In particular, we plan the MRFM studies of multi-vortex states
in elliptical nanodiscs; antivortex states in cross-like particles; skyrmion
states in films with perpendicular anisotropy; domain walls in nanowires;
helical states in multilayer sandwich nanodisks; artificially frustrated
magnetic nanostructures (spin ice) on the basis of single-layer and
multilayer nanoparticles, etc. The effects of restructuring of FMR spectrum
and mode composition during the samples remagnetizing processes in an
external magnetic field will be investigated. All planned investigations and the expected results
correspond to the world level of researches in this field. The project
results will be used in the educational process. We plan the development of
the new section "Methods of magnetic resonance microscopy" in the
course "The Fundamentals of the scanning probe microscopy" and
laboratory work for the students of Lobachevsky Nizny Novgorod State
University will be organized. We expect an increased interest in MRFM primarily
from the scientific and educational organizations, which are actively
involved in the study of ferromagnetic nanostructures, such as the Institute
of Physical Problems RAS, Physical-Technical
Institute RAS, IRE RAS, Kazan Physical-Technical Institute RAS, Mo scow State
University, Nizny Novgorod State University and others. |
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