Birck Nanotechnology Center, Purdue University, West Lafayette, IN
Recent additions to the recharge center at the Birck Nanotechnology Center in Purdue’s Discovery Park include an MPMS‐3 SQUID magnetometer and a DynaCool Physical Properties Measurement System from Quantum Design. The MPMS‐3 measures the DC and AC magnetic moment of bulk, film or powder samples from 1.8 K – 1000 K and in applied fields up to 7 tesla. The system is also capable of simultaneous electrical excitation for magnetoelectric (multiferroic) investigations. Powered by a SQUID, it can achieve better than 10‐8 emu sensitivity which enables quantitative studies of ultrathin (<1 nm) films of magnetic materials. Magnetic anisotropy measurements are one common application for the MPMS‐3 (see figure). The DynaCool measures electrical, magnetic and thermal properties of samples down to 1.8 K and in applied fields up to 9 tesla. Being a general field/temperature platform, it is capable of adding customized probes, optical and RF measurements. The most popular measurement for the user group is magnetotransport (Hall effect, magneto‐resistance) of magnetic films and devices, sometimes utilizing the automated sample rotation insert. After reivewing the capabilities of the instruments, I will highlight some research results on both instruments including voltage‐controlled magnetic anisotropy, ferromagnetic resonance (FMR) spectroscopy, and finally magnetotransport with a look ahead to new high‐sensitivity electronics for carrier mobility detemination in low mobility systems.
By Donald P. Arnold, Electrical and Computer Engineering, University of Florida, Gainesville, FL
This talk highlights the development of microfabricated permanent magnets and their application in various functional microsystems. Basic concepts about magnets and physical scaling laws are introduced. Two types of permanent magnet materials—electroplated layers and bonded powders—that overcome certain manufacturing and integration challenges are presented, along with the batch-fabrication process to create complex magnetic pole patterns in thick films, the method used to characterize the stray fields at the micro-scale, and they way these tiny magnets are being used for electromechanical transducers, nanomanufacturing, and microrobots.
By Beth Stadler, Professor of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN
Bio-sensing Summer Series 2010: Biomimetic Cilia Sensor Arrays Using Electrochemically Synthesized Magnetic Nanowires
By Adeel Ahmad, University of Illinois at Urbana-Champaign