44 citations · 146 across the 13 of their papers we have counts for
13 papers
Conductance, continuity, and ferromagnetic percolation thresholds in thin films
Gregory Kopnov, Alexander Gerber
Classical percolation models predict the metal-insulator transition and the onset of the long-range ferromagnetic order at the same topological continuity threshold. We tested this…
Tuning the perpendicular anisotropy of ferromagnetic films by thickness, width, and profile
Gregory Kopnov, Alexander Gerber
Perpendicular magnetic anisotropy was found to be highly sensitive to the nominal thickness and morphology of laterally heterogeneous CoPd films in the vicinity of the metal insula…
Resistivity testing of palladium dilution limits in CoPd alloys for hydrogen storage
S. S. Das, G. Kopnov, A. Gerber
Palladium satisfies most of the requirements for an effective hydrogen storage material with two major drawbacks: it has a relatively low gravimetric hydrogen density and is prohib…
Non-reciprocal magnetoresistance, directional inhomogeneity and mixed symmetry Hall devices
Gregory Kopnov, Alexander Gerber
Phenomenology similar to the nonreciprocal charge transport violating Onsagers reciprocity relations can develop in directionally inhomogeneous conducting films with nonuniform Hal…
Kinetics of the lattice response to hydrogen absorption in thin Pd and CoPd films
S. S. Das, G. Kopnov, A. Gerber
Hydrogen can penetrate reversibly a number of metals, occupy the interstitial sites and cause large expansion of the crystal lattice. The question discussed here is whether the kin…
Positive versus negative resistance response to hydrogenation in palladium and its alloys
Sudhansu Sekhar Das, Gregory Kopnov, Alexander Gerber
Resistive solid state sensors are widely used in multiple applications, including molecular and gas detection. Absorption or intercalation of the target species varies the lattice…
Detection of hydrogen by the extraordinary Hall effect in CoPd alloys
S. S. Das, G. Kopnov, A. Gerber
Effect of hydrogen adsorption on the extraordinary Hall phenomenon (EHE) in ferromagnetic CoPd films is studied as a function of composition, thickness, substrate and hydrogen conc…
Longitudinal and transverse magnetoresistance in films with tilted out-of-plane magnetic anisotropy
Noga Eden, Gregory Kopnov, Shachar Fraenkel +2
Tilted off-plane magnetic anisotropy induces two unusual characteristic magnetotransport phenomena: extraordinary Hall effect in the presence of an in-plane magnetic field, and non…
Hall effect spintronics for gas detection
A. Gerber, G. Kopnov, M. Karpovski
We present the concept of magnetic gas detection by the Extraordinary Hall effect (EHE). The technique is compatible with the existing conductometric gas detection technologies and…
Scaling of the Hall effects beyond the quantum resistance threshold in oxidized CoFeB
A. Gerber, G. Kopnov
The ordinary and the extraordinary Hall effects were studied in gradually oxidized amorphous CoFeB ferromagnets over six orders of resistivity from the metallic to the strongly ins…
MegaOhm Extraordinary Hall effect in oxidized CoFeB
G. Kopnov, A. Gerber
We report on development of controllably oxidized CoFeB ferromagnetic films demonstrating the extraordinary Hall effect (EHE) resistivity exceeding 1 Ohmcm and magnetic field sensi…
A Superconducting Gap in an Insulator
D. Sherman, G. Kopnov, D. Shahar +1
We present tunneling spectroscopy and transport measurements on disordered indium oxide films that reveal the existence of a superconducting gap in an insulating state. Two films o…
Anisotropic magnetization of RuEu1.5Ce0.5Sr2Cu2O10 (Ru-1222) thin films
I. Felner, G. Kopnov, G. Koren
A dc magnetic study is reported on c-axis oriented epitaxial thin films of EuSr2Eu1.5Ce0.5Cu2O10 (Ru-1222) on (100) SrTiO3 wafers. Magnetic measurements on 200 and 500 nm thick fil…