Publications (23)
Magnetization driven metal - insulator transition in strongly disordered Ge:Mn magnetic semiconductors
O. Riss, A. Gerber, I. Ya. Korenblit +3
We report on the temperature and field driven metal-insulator transition in disordered Ge:Mn magnetic semiconductors accompanied by magnetic ordering, magnetoresistance reaching th…
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…
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…
Proximity effect in granular superconductor-normal metal structures
I. Sternfeld, V. Shelukhin, A. Tsukernik +3
We fabricated three-dimensional disordered Pb-Cu granular structures, with various metal compositions. The typical grain size of both metals is smaller than the superconductor and…
Reversal of the extraordinary Hall effect polarity in thin Co/Pd multilayers
D. Rosenblatt, M. Karpovski, A. Gerber
Thin Co/Pd multilayers, with room temperature perpendicular anisotropy and an enhanced surface scattering, were studied for the possible use in the extraordinary Hall effect (EHE)…
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…
Hydrogen-Induced Sign Reversal in Magnetic Hysteresis Evolution of CoPd Alloys and Co/Pd Multilayers
S. S. Das, A. Gerber
Hydrogen absorption in magnetic thin film nanostructures can modulate their electronic, magnetic, and transport properties by modifying the electronic structure and lattice strain.…
The Weyl-Lanczos Equations and the Lanczos Wave Equation in 4 Dimensions as Systems in Involution
P. Dolan, A. Gerber
Using the work by Bampi and Caviglia, we write the Weyl-Lanczos equations as an exterior differential system. Using Janet-Riquier theory, we compute the Cartan characters for all s…
Inhomogeneity and transverse voltage in superconductors
A. Segal, M. Karpovski, A. Gerber
Voltages parallel and transverse to electric current in slightly inhomogeneous superconductors can contain components proportional to the field and temperature derivatives of the l…
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…
Dynamics of Successive Minor Hysteresis Loops
Y. W. Windsor, A. Gerber, M. Karpovski
Cumulative growth of successive minor hysteresis loops in Co/Pd multilayers with perpendicular anisotropy was studied in the context of time dependent magnetization reversal dynami…
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…
Magnetoconductivity of icosahedral and amorphous Al-Pd-Re films - a comparison
R. Haberkern, R. Rosenbaum, H. Bekar +4
The magnetoconductivity of quasicrystals is often discussed in the frame of quantum corrections, namely weak (anti-) localiza-tion and electron-electron interaction. A premise for…
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…
Remarkable change of tunneling conductance in YBCO films in fields up to 32.4T
R. Beck, Y. Dagan, A. Milner +4
We studied the tunneling density of states in YBCO films under strong currents flowing along node directions. The currents were induced by fields of up to 32.4T parallel to the fil…
The Mid-Infrared Luminosity Evolution and Luminosity Function of Quasars with SDSS and WISE
J. Singal, J. George, A. Gerber
We determine the 22m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux-limited Sloan Digital Sky Survey…
Asymmetric field dependence of magnetoresistance in magnetic films
A. Segal, O. Shaya, M. Karpovski +1
We study an asymmetric in field magnetoresistance that is frequently observed in magnetic films and, in particular, the odd longitudinal voltage peaks that appear during magnetizat…
Correlation between the Extraordinary Hall Effect and Resistivity
A. Gerber, A. Milner, A. Finkler +6
We study the contribution of different types of scattering sources to the extraordinary Hall effect. Scattering by magnetic nano-particles embedded in normal-metal matrix, insulati…
Absence of the Ordinary and Extraordinary Hall effects scaling in granular ferromagnets at metal-insulator transition
D. Bartov, A. Segal, M. Karpovski +1
Universality of the extraordinary Hall effect scaling was tested in granular three-dimensional Ni-SiO2 films across the metal-insulator transition. Three types of magnetotransport…
Sixteen-state magnetic memory based on the extraordinary Hall effect
A. Segal, M. Karpovski, A. Gerber
We report on a proof-of-concept study of split-cell magnetic storage in which multi-bit magnetic memory cells are composed of several multilevel ferromagnetic dots with perpendicul…
Perspective of spintronics applications based on the Extraordinary Hall Effect
A. Gerber, O. Riss
Extraordinary Hall effect (EHE) is a spin-dependent phenomenon that generates voltage proportional to magnetization across a current carrying magnetic film. Magnitude of the effect…
Order parameter node removal in the d-wave superconductor under magnetic field
R. Beck, Y. Dagan, A. Milner +2
hether the node in the order parameter characteristic of a superconductor can or cannot be removed by an applied magnetic field has been a subject of debate in recent year…
Resistivity Minimum in Granular Composites and Thin Metallic Films
A. Gerber, I. Kishon, D. Bartov +1
We analyze the temperature dependence of conductivity in thick granular ferromagnetic compounds NiSiO2 and in thin weakly coupled films of Fe, Ni and Py in vicinity of metal-insula…