Materials Characterization at High Magnetic Felds and Extreme Temperatures: Focus on Magnetism
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.
Neil Dilley is a physicist specializing in cryogenic measurements and design. His doctorate work at UC San Diego (Ph.D. 1999) focused on sythesis and characterization of rare earth intermetallic compounds which exhibit superconductivity and magnetism. Neil’s current research interests are in magnetic materials discovery, spintronics, and nanomagnetism. He joined Birck after working for 16 years at Quantum Design, Inc. in both R&D and applications where he instructed and collaborated with materials researchers around the world.
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