The work is devoted to the study of the processes of formation and analysis of the parameters of ... more The work is devoted to the study of the processes of formation and analysis of the parameters of a functional nanostructure — a superconducting spin valve, which is a multilayer structure consisting of ferromagnetic cobalt nanolayers separated by niobium superconductor nanolayers. The aim of the work was to study the influence of the main parameters of the technological regimes of the formation of these nanosystems: temperature, concentration and spatial distribution of deposited atoms over the surface of the nanosystem on the atomic structure and morphology of the nanosystem. The studies were carried out by the molecular dynamics method using the many-particle potential of the modified immersed atom method. The temperature in the calculation process was controlled using the Nose-Hoover thermostat. The simulation of the formation of atomic nanolayers by the method of alternating directional deposition of layers of different compositions under high vacuum and stationary temperature ...
Molecular dynamics modeling of formation processes parameters influence on a superconducting spin valve structure and morphology, 2020
The work is devoted to the study of the processes of formation and analysis of the
parameters of ... more The work is devoted to the study of the processes of formation and analysis of the parameters of a functional nanostructure — a superconducting spin valve, which is a multilayer structure consisting of ferromagnetic cobalt nanolayers separated by niobium superconductor nanolayers. The aim of the work was to study the influence of the main parameters of the technological regimes of the formation of these nanosystems: temperature, concentration and spatial distribution of deposited atoms over the surface of the nanosystem on the atomic structure and morphology of the nanosystem. The studies were carried out by the molecular dynamics method using the many-particle potential of the modified immersed atom method. The temperature in the calculation process was controlled using the Nose-Hoover thermostat. The simulation of the formation of atomic nanolayers by the method of alternating directional deposition of layers of different compositions under high vacuum and stationary temperature conditions is performed. As a result of the studies, the structure and thickness of the formed nanolayers and the distribution of elements in the area of their interface were studied. It is shown that alternating layers of the formed layered nanosystem and their interfaces have a significantly different atomic structure depending on the main parameters of the technological regimes of the formation of layered nanosystems.
We present a study of magnetic structures with controllable effective exchange energy for Josephs... more We present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin superconductors (s). Our calculations based on the Usadel equations show that switching from parallel (P) to antiparallel (AP) alignment of neighboring F layers can lead to a significant enhancement of the critical current through the junction. To control the magnetic alignment we propose to use a periodic system whose unit cell is a pseudo spin valve of structure F 1 /s/F 2 /s where F 1 and F 2 are two magnetic layers having different coercive fields. In order to check the feasibility of controllable switching between AP and P states through the whole periodic structure, we prepared a superlattice [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)] 6 between two superconducting layers of Nb(25 nm). Neutron scattering and magnetometry data showed that parallel and antiparallel alignment can be controlled with a magnetic field of only several tens of Oersted. 833 Findings Superconductor digital devices have attracted growing attention due to their unique energy efficiency and performance , and also due to compatibility with a number of quantum and neuromorphic computers under development . However the lack of cryogenic memory elements (including synapses) with sufficiently fast switching between stable states and suffi-Beilstein J. Nanotechnol. 2019, 10, 833-839.
We present a study of magnetic structures with controllable effective exchange energy for Josephs... more We present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin super-conductors (s). Our calculations based on the Usadel equations show that switching from parallel (P) to antiparallel (AP) alignment of neighboring F layers can lead to a significant enhancement of the critical current through the junction. To control the magnetic alignment we propose to use a periodic system whose unit cell is a pseudo spin valve of structure F 1 /s/F 2 /s where F 1 and F 2 are two magnetic layers having different coercive fields. In order to check the feasibility of controllable switching between AP and P states through the whole periodic structure, we prepared a superlattice [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)] 6 between two super-conducting layers of Nb(25 nm). Neutron scattering and magnetometry data showed that parallel and antiparallel alignment can be controlled with a magnetic field of only several tens of Oersted. 833 Findings Superconductor digital devices have attracted growing attention due to their unique energy efficiency and performance [1], and also due to compatibility with a number of quantum and neuromorphic computers under development [2-4]. However the lack of cryogenic memory elements (including synapses) with sufficiently fast switching between stable states and suffi
The work is devoted to the study of the processes of formation and analysis of the parameters of ... more The work is devoted to the study of the processes of formation and analysis of the parameters of a functional nanostructure — a superconducting spin valve, which is a multilayer structure consisting of ferromagnetic cobalt nanolayers separated by niobium superconductor nanolayers. The aim of the work was to study the influence of the main parameters of the technological regimes of the formation of these nanosystems: temperature, concentration and spatial distribution of deposited atoms over the surface of the nanosystem on the atomic structure and morphology of the nanosystem. The studies were carried out by the molecular dynamics method using the many-particle potential of the modified immersed atom method. The temperature in the calculation process was controlled using the Nose-Hoover thermostat. The simulation of the formation of atomic nanolayers by the method of alternating directional deposition of layers of different compositions under high vacuum and stationary temperature ...
Molecular dynamics modeling of formation processes parameters influence on a superconducting spin valve structure and morphology, 2020
The work is devoted to the study of the processes of formation and analysis of the
parameters of ... more The work is devoted to the study of the processes of formation and analysis of the parameters of a functional nanostructure — a superconducting spin valve, which is a multilayer structure consisting of ferromagnetic cobalt nanolayers separated by niobium superconductor nanolayers. The aim of the work was to study the influence of the main parameters of the technological regimes of the formation of these nanosystems: temperature, concentration and spatial distribution of deposited atoms over the surface of the nanosystem on the atomic structure and morphology of the nanosystem. The studies were carried out by the molecular dynamics method using the many-particle potential of the modified immersed atom method. The temperature in the calculation process was controlled using the Nose-Hoover thermostat. The simulation of the formation of atomic nanolayers by the method of alternating directional deposition of layers of different compositions under high vacuum and stationary temperature conditions is performed. As a result of the studies, the structure and thickness of the formed nanolayers and the distribution of elements in the area of their interface were studied. It is shown that alternating layers of the formed layered nanosystem and their interfaces have a significantly different atomic structure depending on the main parameters of the technological regimes of the formation of layered nanosystems.
We present a study of magnetic structures with controllable effective exchange energy for Josephs... more We present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin superconductors (s). Our calculations based on the Usadel equations show that switching from parallel (P) to antiparallel (AP) alignment of neighboring F layers can lead to a significant enhancement of the critical current through the junction. To control the magnetic alignment we propose to use a periodic system whose unit cell is a pseudo spin valve of structure F 1 /s/F 2 /s where F 1 and F 2 are two magnetic layers having different coercive fields. In order to check the feasibility of controllable switching between AP and P states through the whole periodic structure, we prepared a superlattice [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)] 6 between two superconducting layers of Nb(25 nm). Neutron scattering and magnetometry data showed that parallel and antiparallel alignment can be controlled with a magnetic field of only several tens of Oersted. 833 Findings Superconductor digital devices have attracted growing attention due to their unique energy efficiency and performance , and also due to compatibility with a number of quantum and neuromorphic computers under development . However the lack of cryogenic memory elements (including synapses) with sufficiently fast switching between stable states and suffi-Beilstein J. Nanotechnol. 2019, 10, 833-839.
We present a study of magnetic structures with controllable effective exchange energy for Josephs... more We present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin super-conductors (s). Our calculations based on the Usadel equations show that switching from parallel (P) to antiparallel (AP) alignment of neighboring F layers can lead to a significant enhancement of the critical current through the junction. To control the magnetic alignment we propose to use a periodic system whose unit cell is a pseudo spin valve of structure F 1 /s/F 2 /s where F 1 and F 2 are two magnetic layers having different coercive fields. In order to check the feasibility of controllable switching between AP and P states through the whole periodic structure, we prepared a superlattice [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)] 6 between two super-conducting layers of Nb(25 nm). Neutron scattering and magnetometry data showed that parallel and antiparallel alignment can be controlled with a magnetic field of only several tens of Oersted. 833 Findings Superconductor digital devices have attracted growing attention due to their unique energy efficiency and performance [1], and also due to compatibility with a number of quantum and neuromorphic computers under development [2-4]. However the lack of cryogenic memory elements (including synapses) with sufficiently fast switching between stable states and suffi
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Papers by Vladimir Boian
parameters of a functional nanostructure — a superconducting spin valve, which is a
multilayer structure consisting of ferromagnetic cobalt nanolayers separated by
niobium superconductor nanolayers. The aim of the work was to study the influence
of the main parameters of the technological regimes of the formation of these
nanosystems: temperature, concentration and spatial distribution of deposited atoms
over the surface of the nanosystem on the atomic structure and morphology of the
nanosystem. The studies were carried out by the molecular dynamics method using
the many-particle potential of the modified immersed atom method. The temperature
in the calculation process was controlled using the Nose-Hoover thermostat. The
simulation of the formation of atomic nanolayers by the method of alternating
directional deposition of layers of different compositions under high vacuum and
stationary temperature conditions is performed. As a result of the studies, the
structure and thickness of the formed nanolayers and the distribution of elements in
the area of their interface were studied. It is shown that alternating layers of the
formed layered nanosystem and their interfaces have a significantly different atomic
structure depending on the main parameters of the technological regimes of the
formation of layered nanosystems.
parameters of a functional nanostructure — a superconducting spin valve, which is a
multilayer structure consisting of ferromagnetic cobalt nanolayers separated by
niobium superconductor nanolayers. The aim of the work was to study the influence
of the main parameters of the technological regimes of the formation of these
nanosystems: temperature, concentration and spatial distribution of deposited atoms
over the surface of the nanosystem on the atomic structure and morphology of the
nanosystem. The studies were carried out by the molecular dynamics method using
the many-particle potential of the modified immersed atom method. The temperature
in the calculation process was controlled using the Nose-Hoover thermostat. The
simulation of the formation of atomic nanolayers by the method of alternating
directional deposition of layers of different compositions under high vacuum and
stationary temperature conditions is performed. As a result of the studies, the
structure and thickness of the formed nanolayers and the distribution of elements in
the area of their interface were studied. It is shown that alternating layers of the
formed layered nanosystem and their interfaces have a significantly different atomic
structure depending on the main parameters of the technological regimes of the
formation of layered nanosystems.