Publications (16)
Tunneling magnetoresistance of perpendicular CoFeB-based junctions with exchange bias
Orestis Manos, Alexander Böhnke, Panagiota Bougiatioti +5
Recently, magnetic tunnel junctions with perpendicular magnetized electrodes combined with exchange bias films have attracted large interest. In this paper we examine the tunnel ma…
Temperature dependence of the spin Hall angle and switching current in the nc-W(O)/CoFeB/MgO system with perpendicular magnetic anisotropy
Lukas Neumann, Daniel Meier, Jan Schmalhorst +3
We investigated the temperature dependence of the switching current for a perpendicularly magnetized CoFeB film deposited on a nanocrystalline tungsten film with large oxygen conte…
Co-sputtered PtMnSb thin films and PtMnSb/Pt bilayers for spin-orbit torque investigations
Jan Krieft, Johannes Mendil, Myriam H. Aguirre +7
The manipulation of the magnetization by spin-orbit torques (SOTs) has recently been extensively studied due to its potential for efficiently writing information in magnetic memori…
Disentangling complex current pathways in a metallic Ru/Co bilayer nanostructure using THz spectroscopy
Nicolas S. Beermann, Savio Fabretti, Karsten Rott +3
Many modern spintronic technologies, such as spin valves, spin Hall applications, and spintronic THz emitters, are based on electrons crossing buried internal interfaces within met…
Spin-transfer torque switching at ultra low current densities
Johannes Christian Leutenantsmeyer, Vladyslav Zbarsky, Steffen Wittrock +9
The influence of the tantalum buffer layer on the magnetic anisotropy of perpendicular Co-Fe-B/MgO based magnetic tunnel junctions is studied using magneto-optical Kerr-spectroscop…
On/off switching of bit readout in bias-enhanced tunnel magneto-Seebeck effect
Alexander Boehnke, Marius Milnikel, Marvin Walter +8
Thermoelectric effects in magnetic tunnel junctions are currently an attractive research topic. Here, we demonstrate that the tunnel magneto-Seebeck effect (TMS) in CoFeB/MgO/CoFeB…
Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions
Niklas Liebing, Santiago Serrano-Guisan, Patryk Krzysteczko +5
We study the tunneling magneto thermopower and tunneling magneto thermocurrent of CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJ). The devices show a clear change of the thermoelec…
Correlation of tunnel magnetoresistance with the magnetic properties in perpendicular CoFeB-based junctions with exchange bias
Orestis Manos, Panagiota Bougiatioti, Denis Dyck +4
We investigate the dependence of magnetic properties on the post-annealing temperature/time, the thickness of soft ferromagnetic electrode and Ta dusting layer in the pinned electr…
Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction
Alexander Boehnke, Marvin Walter, Niklas Roschewsky +6
Recently, several groups have reported spin-dependent thermoelectric effects in magnetic tunnel junctions. In this paper, we present a setup for time-resolved measurements of therm…
Current induced resistance change of magnetic tunnel junctions with ultra-thin MgO tunnel barriers
Patryk Krzysteczko, Xinli Kou, Karsten Rott +2
Ultra-thin magnetic tunnel junctions with low resistive MgO tunnel barriers are prepared to examine their stability under large current stress. The devices show magnetoresistance r…
Towards wafer scale inductive characterization of spin transfer torque critical current density of magnetic tunnel junction stacks
Sibylle Sievers, Niklas Liebing, Santiago Serrano-Guisan +12
We explore the prospects of wafer scale inductive probing of the critical current density for spin transfer torque switching of a CoFeB/MgO/CoFeB magnetic tunnel junction…
Unusual angular dependence of tunneling magneto-Seebeck effect
Christian Heiliger, Michael Czerner, Niklas Liebing +4
We find an unusual angular dependence of the tunneling magneto-Seebeck effect (TMS). The conductance shows normally a cosine-dependence with the angle between the magnetizations of…
Parameter space for thermal spin-transfer torque
Johannes Christian Leutenantsmeyer, Marvin Walter, Vladyslav Zbarsky +10
Thermal spin-transfer torque describes the manipulation of the magnetization by the application of a heat flow. The effect has been calculated theoretically by Jia et al. in 2011.…
Proximity-induced superconductivity and quantum interference in topological crystalline insulator SnTe thin film devices
Robin-Pierre Klett, Joachim Schönle, Andreas Becker +12
Topological crystalline insulators represent a new state of matter, in which the electronic transport is governed by mirror-symmetry protected Dirac surface states. Due to the heli…
NiTi Single Crystal Growth by Micro-Pulling-Down Method: Experimental Setup and Material Characterization
Timon Sieweke, Chris Luther, Martin Wortmann +14
Nickel-titanium that has an austenite to martensite phase transition has been studied extensively in the past as a shape memory alloy, but a lot remains to be learned from such pha…
Sign change in the tunnel magnetoresistance of Fe3O4/MgO/Co-Fe-B magnetic tunnel junctions depending on the annealing temperature and the interface treatment
Luca Marnitz, Karsten Rott, Stefan Niehörster +12
Magnetite (Fe3O4) is an eligible candidate for magnetic tunnel junctions (MTJs) since it shows a high spin polarization at the Fermi level as well as a high Curie temperature of 58…