A5052236674- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Magnetic Properties and Applications
- Magnetic Bearings and Levitation Dynamics
- Magnetic and transport properties of perovskites and related materials
- Superconducting Materials and Applications
- Metallic Glasses and Amorphous Alloys
- ZnO doping and properties
- Surface and Thin Film Phenomena
- Frequency Control in Power Systems
- Theoretical and Computational Physics
- Electric Motor Design and Analysis
- X-ray Diffraction in Crystallography
- Magneto-Optical Properties and Applications
- Machine Learning in Materials Science
- Air Traffic Management and Optimization
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Advanced Condensed Matter Physics
- Superconductivity in MgB2 and Alloys
- Defense, Military, and Policy Studies
- Advanced Aircraft Design and Technologies
- Electromagnetic Launch and Propulsion Technology
- Copper Interconnects and Reliability
Leibniz Institute for Solid State and Materials Research
2001-2009
After the levitation force relaxation was studied for different field-cooling height and working-levitation height, high-temperature superconductor (HTS) bulk horizontally moved in lateral direction above permanent magnet guideway. Both guidance were collected by measurement system at same time. It found that decay of is dependent on both maximum displacement movement cycle times, while hysteresis curve does not change after first cycle. This work provided scientific analysis HTS maglev design.
The technical progress in the manufacture of high temperature superconducting bulk material (HTS) provides various possible applications. These include non-contact linear transport systems and frictionless rotating bearings using pinning effect Type-II superconductors. During last five years, a group industrial research partners have developed an innovative magnetic levitation system (SupraTrans) with permanent rail YBCO bulks vehicle. To optimize guidance system, further investigations...
The complex microstructure of melt grown YBCO bulk material and the non-linear electromagnetic behavior makes it difficult to determine their thermal, electrical magnetic properties. knowledge these parameters is essential design superconducting bearings (SMB) for various applications. main characteristic a SMB levitation force that arises between superconductor source. availability simulation tools can greatly simplify new prototypes. An algorithm based on critical state model Finite...
Within the SupraTrans project, a joint venture between research institutes, universities and industrial companies, full working prototype of superconductively levitated transport system has been constructed developed. The levitation guidance is based on flux pinning in melt-textured bulk YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O...
An epitaxial Y2O3/YSZ/CeO2 buffer architecture has been prepared on cube textured Ni–5 at.%W, Ni–7.5 at.%W and Ni–9 tapes using pulsed laser deposition. The layer growth was studied in detail revealed a good texture transfer throughout the structure global as well local scale. YBCO (yttrium barium copper oxide) layers were successfully deposited buffered tapes, showing an in-plane spread of about 7°. Microstructural investigations clear interfaces homogeneous surface structure. A...
This paper will deliver insight into technology and physics of the levitation system for SupraTrans project, a prototype superconducting transportation system. The used herein bases on flux pinning in melt-textured bulk YBa2Cu3O7-X (YBCO) that stabilizes lateral vertical position vehicle above magnetic track. A track made from permanent magnets soft steel-yokes acting as collectors has been designed its capability is presented. concept also includes fast electromagnetic turnout switch to...
The stability of the reference magnetization in exchange-biased NiO (10--13 nm)/Cu (0.2--0.8 nm)/Permalloy (10 nm) layers was investigated by Kerr microscopic domain studies an optical cryostat. coupling found to depend on temperature and direction applied magnetic field. We discovered different blocking temperatures ${T}_{B,hard}>{T}_{B,easy}$ for hard easy axis reversals. Moving $180\ifmmode^\circ\else\textdegree\fi{}$ walls are able permanently switch pinning...
We used Kerr microscopy to investigate the magnetization processes of NiFeCo/Cu/Co/FeMn spin-valve meanders for magnetoresistive sensors and compared them in related single films bilayers. observed irregular switching, characterized by irreversible decay blocked domains or domain nucleation at 360/spl deg/ walls, free layer system. Both effects are connected with hysteresis. Edge-curling walls responsible rotational hysteresis giant magnetoresistance signal spin valves, occurring during...
The magnetic domain structure in Permalloy (Ni81Fe19) micropatterns (10–100 μm) on NiO has been investigated by means of soft x-ray photoemission electron microscopy. exchange anisotropy between the Ni81Fe19 patterns and layer results formation complex structures which markedly differ from simple Landau–Lifshitz configurations. reflect competition dipole–dipole interaction a weakly coupled system. observed change with feature size, as lose complexity smaller structures.
The two key parameters for levitation performance over a permanent magnet (PM) guideway are the force and stiffness of high temperature superconductor (HTS) YBaCuO bulk. Their distributions along lateral displacement (LD) were measured in zero-field-cooling (ZFC) field-cooling (FC) conditions. There cases applied magnetic field single HTS bulk: symmetrical or unsymmetrical about bulk axis. Although has linear relationship with case, such disappears once becomes unsymmetrical. Furthermore, is...
The magnetic microstructure and magnetization processes of sputtered IrMn-NiFe exchange-biased films were studied by Kerr microscopy magneto-optical magnetometry in a temperature range from room to 200/spl deg/C. A ferromagnetic film the state (as created cooling regular domain pattern or saturated above blocking temperature) is reversed patch-like way applied fields, indicating inhomogeneities coupling. are reversible far below T/sub B/ get increasingly irreversible within some 10 K around...
Summary form only given. For tunneling magnetoresistance (TMR) sensor applications, the magnetic properties of both, soft detection layer and hard reference layer, have to be optimized. either artificial antiferromagnet (AAF) subsystems, exchange biased layers or a combination two are commonly used. In this work we studied microstructure magnetization processes sputtered IrMn/Permalloy, IrMn/CoFe IrMn/CoFe-AAF systems by Kerr microscopy magneto-optical magnetometry in temperature range...
Summary form only given. Exchange coupling between ferromagnetic and antiferromagnetic films provides a fixed reference magnetization, which is essential for spin-valves in magnetoelectronic devices based on GMR or TMR effects. In this paper the stability of magnetization addressed by means domain studies NiO (10 nm)/Cu (0.5 nm)/Permalloy nm) layers using Kerr microscopy. Low-temperature observation an optical cryostat was necessary, because temperature reduced to about 200K 10 nm thick...