Colloquium: Chris Palmstrom, Heteroepitaxial Growth of Novel Materials and Structures

Professor, Electrical and Computer Engineering, Un. of California, Santa Barbara

All dates for this event occur in the past.

113 Dreese Labs
2015 Neil Ave
Columbus, OH 43210
United States

Abstract

The ability to integrate dissimilar materials with different crystal structures and properties enables heterostructures to be developed with new functionality. Lattice matching, interfacial bonding and reactions are issues that need to be addressed for heteroepitaxial growth of dissimilar materials.  Molecular beam epitaxial (MBE) growth in combination with in-situ and ex-situ atomic level characterization techniques enables studies of nucleation and epitaxial growth processes and interfacial reactions. We have investigated the growth of a number of epitaxial metals on III-V semiconductors and metal oxides including ferromagnetic Fe, FeCo, Heusler alloys (such as Ni2MnGa, Co2MnGe), and rare earth monopnictides-III-V semiconductor nanocomposites. These studies have been used to optimize interface and material properties of these epitaxial metallic compound heterostructures for semiconductor spintonics, thermoelectric and shape memory applications.

Bio

 

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Dr. Christopher J. Palmstrom

CHRIS J. PALMSTRØM is a Professor in the Electrical and Computer Engineering and the Materials Departments at the University of California, Santa Barbara. His research involves atomic level control and interface formation during molecular beam and chemical beam epitaxial growth of metallic compounds, metal oxides and compound semiconductors. He received his B.Sc. in physics and electronic engineering and Ph.D. in electrical and electronic engineering from the University of Leeds. After being a Lecturer in Norway and a Research Associate at Cornell, he joined Bellcore as a Member of Technical Staff in 1985. From 1994-2007 he was a Professor in the Department of Chemical Engineering and Materials Science at the University of Minnesota in 2004 and became the Amundson Chair Professor In 2007 he joined the faculty at the University of California, Santa Barbara. He has pioneered dissimilar materials epitaxial growth studies using a combination of molecular beam epitaxial growth with in-situ surface science probes including STM, XPS and AES, and ex-situ structural and electronic characterization. An important aspect of his work has been to go beyond surface science and structural studies to make materials for device structures allowing for detailed electrical and optical measurements of materials and interfacial properties. Specific studies have emphasized metallization of semiconductors, dissimilar materials epitaxial growth, thin film analysis, and molecular beam and chemical beam epitaxial growth of III-V semiconductor heterostructures, metallic compounds, metal oxides, multifunctional, magnetic, thermoelectric, and spintronic materials, and superconductors. He is the author of 225+ publications, including five review chapters and research monographs. Chris is a Fellow of AVS  APS, and MRS.

Co-sponsor

 

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This talk is co-sponsored by the Center for Emergent Materials (CEM). The CEM, a National Science Foundation (NSF) supported Materials Research Science and Engineering Center (MRSEC), performs integrated research on emergent materials and phenomena in magnetoelectronics, creating new paradigms in computing and information storage. The research activities conducted at the CEM focus on a new understanding of electron-spin injection and transport, and the synthesis and exploitation of multifunctional properties of innovative double perovskite heterostructures. The CEM also has an active Seed Funding program, aimed at supporting new ideas with the potential for transformative impact on science and technology.

Education is an important component of the center's research activities. CEM programs take an interactive, constructionist approach to address the nature and cognitive cause of the misconception of materials science concepts. Other activities include developing high-school materials science courses, training teachers, providing research opportunities to undergraduates, and K-12 outreach.