Publications by authors named "Bohdan Kundys"

YbRhSn crystallizes with a unique structural arrangement [space group 4/, = 9.6997(4) Å, = 13.7710(7) Å], which is related with primitive cubic YbRhSn and body-centered tetragonal (SnTb)TbRhSn types.

View Article and Find Full Text PDF

Ultralow dimensionality of 2D layers magnifies their sensitivity to adjacent charges enabling even postprocessing electric control of multifunctional structures. However, functionalizing 2D layers remains an important challenge for on-demand device-property exploitation. Here we report that an electrical and even fully optical way to control and write modifications to the magnetoresistive response of CVD-deposited graphene is achievable through the electrostatics of the photoferroelectric substrate.

View Article and Find Full Text PDF

As global data generation continues to rise, there is an increasing demand for revolutionary in-memory computing methodologies and efficient machine learning solutions. Despite recent progress in electrical and electro-optical simulations of machine learning devices, the all-optical nonthermal function remains challenging, with single wavelength operation still elusive. Here we report on an optical and monochromatic way of neuromorphic signal processing for brain-inspired functions, eliminating the need for electrical pulses.

View Article and Find Full Text PDF

Interface-driven effects in ferroelectric van der Waals (vdW) heterostructures provide fresh opportunities in the search for alternative device architectures toward overcoming the von Neumann bottleneck. However, their implementation is still in its infancy, mostly by electrical control. It is of utmost interest to develop strategies for additional optical and multistate control in the quest for novel neuromorphic architectures.

View Article and Find Full Text PDF

The structural and physical properties of YIrSn grown from Sn-flux as large single crystals are studied. YIrSn crystallizes with a unique structure [space group 3̄, = 13.7706(1) Å], which is characterized by a strong disorder.

View Article and Find Full Text PDF

Molecular systems can exhibit multi-stimuli switching of their properties, with spin crossover materials having unique magnetic transition triggered by temperature and light, among others. Light-induced room temperature operation is however elusive, as optical changes between metastable spin states require cryogenic temperatures. Furthermore, electrical detection is hampered by the intrinsic low conductivity properties of these materials.

View Article and Find Full Text PDF

Spin orbit torque driven switching is a favorable way to manipulate nanoscale magnetic objects for both memory and wireless communication devices. The critical current required to switch from one magnetic state to another depends on the geometry and the intrinsic properties of the materials used, which are difficult to control locally. Here, we demonstrate how focused helium ion beam irradiation can modulate the local magnetic anisotropy of a Co thin film at the microscopic scale.

View Article and Find Full Text PDF

Ferroelectric materials are interesting candidates for future photovoltaic applications due to their potential to overcome the fundamental limits of conventional single bandgap semiconductor-based solar cells. Although a more efficient charge separation and above bandgap photovoltages are advantageous in these materials, tailoring their photovoltaic response using ferroelectric functionalities remains puzzling. Here we address this issue by reporting a clear hysteretic character of the photovoltaic effect as a function of electric field and its dependence on the poling history.

View Article and Find Full Text PDF

The superconducting properties of [Formula: see text]MoS [[Formula: see text]] Chevrel phase [[Formula: see text] K] are studied on a sample compacted by spark plasma sintering. Both lower ([Formula: see text] mT) and the upper [[Formula: see text] T] critical magnetic fields are obtained from magnetization and electrical resistivity measurements for the first time. The analysis of the low-temperature electronic specific heat indicates [Formula: see text]MoS to be a two band superconductor with the energy gaps [Formula: see text] meV (95%) and [Formula: see text] meV (5%).

View Article and Find Full Text PDF

Dielectric and magnetodielectric peaks have been evidenced by ε(T, H) measurements in spin induced ferroelectrics: CuCrO(2) and AgCrO(2) delafossites. Such behaviour, also found in several other improper ferroelectrics, can be explained in the frame of Landau analysis of phase transitions with two coupled order parameters: antiferromagnetic ordered moment, L, and polarization, P. The existence of such anomalies in the dielectric constant observed at T(N) is very general.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Notice

Message: fwrite(): Write of 34 bytes failed with errno=28 No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 272

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: /var/lib/php/sessions)

Filename: Unknown

Line Number: 0

Backtrace: