Magneto-ionic control of magnetism is a promising route toward the realization of non-volatile memory and memristive devices. Magneto-ionic oxides are particularly interesting for this purpose, exhibiting magnetic switching coupled to resistive switching, with the latter emerging as a perturbation of the oxygen vacancy concentration. Here, we report on electric-field-induced magnetic switching in a La0.7Sr0.3MnO3 (LSMO) thin film. Correlating magnetic and chemical information via photoemission electron microscopy, we show that applying a positive voltage perpendicular to the film surface of LSMO results in the change in the valence of the Mn ions accompanied by a metal-to-insulator transition and a loss of magnetic ordering. Importantly, we demonstrate that the voltage amplitude provides granular control of the phenomena, enabling fine-tuning of the surface electronic structure. Our study provides valuable insight into the switching capabilities of LSMO that can be utilized in magneto-ionic devices.

Magnetism

Photoemission electron microscopy

10.1063/5.0022150

Cite

Citations (9)

Influence of magnetocrystalline anisotropy on the magnetization dynamics of magnetic microstructures

Journal of Physics Condensed Matter (2009)

Alexander Kaiser C. Wiemann S. Cramm Claus M. Schneider

The study of magnetodynamics using stroboscopic time-resolved x-ray photoemission electron microscopy (TR-XPEEM) involves an intrinsic timescale provided by the pulse structure of the synchrotron radiation. In the usual multi-bunch operation mode, the time span between two subsequent light pulses is too short to allow a relaxation of the system into the ground state before the next pump-probe cycle starts. Using a deflection gating mechanism described in this paper we are able to pick the photoemission signal resulting from selected light pulses. Thus, PEEM measurements can be carried out in a flexible timing scheme with longer delays between two light pulses. Using this technique, the magnetodynamics of both Permalloy and iron structures have been investigated. The differences in the dynamic response on a short magnetic field pulse are discussed with respect to the magnetocrystalline anisotropy.

Magnetocrystalline anisotropy

Photoemission electron microscopy

Magnetization dynamics

10.1088/0953-8984/21/31/314008

Cite

Citations (7)

Stepwise refinement of behavioral VHDL specifications by separation of synchronization and functionality

Claus M. Schneider Wolfgang Ecker

We present a new method of behavioral modeling consisting of separation of synchronization and functionality. In this way incomplete specification and incremental refinement can be performed to reduce the modeling effort in early design stages. Compared to known methods our approach allows early cycle based analysis to select appropriate architectures and to perform parallel/serial tradeoff. Due to the separation of synchronization and functionality the datapath can be developed independently of the controller and thus enables concurrent engineering. Another important characteristic is the reuse friendly architecture proposed in this paper.

Datapath

Separation of concerns

Static timing analysis

10.1109/eurdac.1996.558251

Cite

Citations (6)

Probing the timescale of the exchange interaction in a ferromagnetic alloy

Bulletin of the American Physical Society (2012)

Emrah Turgut Chan La‐o‐vorakiat Mark E. Siemens Margaret M. Murnane Henry C. Kapteyn

Exchange interaction

Source

Cite

Citations (0)

Synthesis and properties of filled carbon nanotubes

Diamond and Related Materials (2003)

A. Leonhardt M. Ritschel R. Kozhuharova Andreas Graff Thomas Mühl

Carbon fibers

Hysteresis

Nanoelectronics

10.1016/s0925-9635(02)00325-4

Cite

Citations (221)

Soft X-Ray Photoelectron Emission-Microscopy (X-PEEM)

Springer eBooks (2006)

Claus M. Schneider

10.1007/1-4020-3337-0_8

Cite

Citations (1)

Electrical resistance of individual defects at a topological insulator surface

Nature Communications (2017)

Felix Lüpke Markus Eschbach Tristan Heider Martin Lanius Peter Schüffelgen

Three-dimensional topological insulators host surface states with linear dispersion, which manifest as a Dirac cone. Nanoscale transport measurements provide direct access to the transport properties of the Dirac cone in real space and allow the detailed investigation of charge carrier scattering. Here we use scanning tunnelling potentiometry to analyse the resistance of different kinds of defects at the surface of a (Bi0.53Sb0.47)2Te3 topological insulator thin film. We find the largest localized voltage drop to be located at domain boundaries in the topological insulator film, with a resistivity about four times higher than that of a step edge. Furthermore, we resolve resistivity dipoles located around nanoscale voids in the sample surface. The influence of such defects on the resistance of the topological surface state is analysed by means of a resistor network model. The effect resulting from the voids is found to be small compared with the other defects.

Topological insulator

Surface States

Surface conductivity

10.1038/ncomms15704

Cite

Citations (38)

Electronic structure of epitaxial NixPd1−x alloy films on Cu3Au(100)

Journal of Applied Physics (2001)

U. Muschiol Michael I. Seider Claus M. Schneider Minn‐Tsong Lin

We studied epitaxially grown single-crystalline chemically disordered ultrathin NixPd1−x alloy films on Cu3Au(100) by means of photoemission using magnetic circular dichroism in the angular distribution. We clearly observe a well-defined three-dimensional band dispersion in 15 monolayer films. On the basis of relativistic selection rules, this dispersion can be related to specific electronic states. Since the spin–orbit coupling (ΔEso) is smaller for Ni than for Pd, the alloy will assume an average value. We find that this average spin–orbit coupling clearly shows up in the electronic structure and correlates directly to the composition of the NiPd alloy film. The results are discussed in terms of a simple qualitative model.

Spin–orbit interaction

10.1063/1.1361261

Cite

Citations (2)

Magnetoresistance in cobalt-contacted multi-wall carbon nanotubes

Journal of Magnetism and Magnetic Materials (2004)

H. Vinzelberg Bo Zhao Ingolf Mönch J. Schumann Claus M. Schneider

Biasing

Ohmic contact

10.1016/j.jmmm.2004.11.465

Cite

Citations (2)