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SUMMARY:From Atoms to Planets: Understanding Planetary Magnetic Records Us
 ing Nanoscale Microscopy - Joshua F. Einsle\, Dept. of Earth Sciences and 
 Dept. of Materials Science &amp\; Metallurgy\, Univeristy of Cambridge
DTSTART:20160513T100000Z
DTEND:20160513T110000Z
UID:TALK65499@talks.cam.ac.uk
CONTACT:Duncan Johnstone
DESCRIPTION:The evolution of planetary magnetic fields are recorded in nan
 oscale magnetic inclusions found in geological materials. Traditional pale
 omagnetism focuses on the measurement and characterisation of ensemble mag
 netic properties found in bulk macroscopic samples. Owing to the developme
 nt of high-sensitivity magnetometers and novel synchrotron techniques\, a 
 new paradigm in paleomagnetic studies is currently being established which
  allows for the study of rare and unique samples from the earliest eras of
  the earth's and the solar system's history. In these samples the critical
  questions revolve around the ability to establish a link between the nano
 structural properties (composition\, chemical ordering and distribution of
  magnetic inclusions) and the magnetic signal measured.  This talk will ex
 plore how advanced microscopy techniques facilitate our understanding of t
 hese new systems and allows for exploration into the fundamental rock magn
 etic behaviour. First\, we will discuss challenges in trying to establish 
 the oldest measurement of the earth’s magnetic field using single grains
  of Zircon. I will present correlative experiments comparing magnetic maps
  with high resolution x-ray tomography which reveal some provoking relatio
 nships between the magnetic signal carriers and the host mineralogy.  We d
 evelop this multi-scale approach further using FIB-nanoTomography to revea
 l the magnetic architecture in a single grain of olivine from a chondritic
  meteorite. This information provides a foundation for an estimate of the 
 magnetic field present in the solar nebula - the accretionary disc of gas 
 and dust that existed in the first 5 Myr of the solar system.  Finally\, I
  will present an in-depth study of a FeNi spinoidial decomposition system 
 unique to meteoritic samples. This system is currently being used as a tim
 e resolved record of core dynamics on small planetary bodies.  Using the a
 tom probe tomography\, STEM EDS tomography\, and scanning precession elect
 ron diffraction we are able to revel the underlying structure and composit
 ion of this alloy.  This seminar will highlight some of the challenging ma
 terials science questions encountered in paleomagnetic research.
LOCATION:Goldsmiths 1\, Lecture room\, Dept. of Materials Science and Meta
 llurgy
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