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Amy Tedstone

About Me

I completed my M.Phys. in Physics at the University of Warwick in 2016. I am currently researching the experimental properties of permanent magnetic materials under the joint supervision of Rachel Edwards and Martin Lees. My project can broadly be split into two parts- an ultrasound part, and a magnetism part.

Ultrasound can track the changes in elastic constant of a material as the temperature is changed or when the material is subjected to a ramping magnetic field. Sudden changes in elastic constant indicate the material has undergone a phase change. This technique is cheaper and more accessible than standard x-ray or neutron scattering experiments. I am currently working on Laves-phase compounds of FeGa, an alloy notable for its dramatically enhanced magnetostrictive properties. Piezoelectric transducers made of quartz are often used to generate and detect ultrasound signals. More exciting are Electromagnetic Acoustic Transducers (EMATs) which induce ultrasonic stress waves in the material via magnetic interactions between the sample and a variable field created by a coil.

The "magnetism" part of my PhD is currently me looking at Ni-doped compounds of GdCo5 (GdCo5-xNix), as part of the PRETAMAG collaboration study into rare earth transition metal magnets . The Ni substitionally replaces the Co on the sublattice, and changes properties such as the saturation magnetisation and coercivity. At the moment, I have been creating polycrystalline samples using an arc furnace. It is hoped that the collaboration can make or acquire some single crystals, in which case I could carry out ultrasound studies on them.

I regularly use the powder x-ray diffractometers, and am learning how to create metallographic slides to confirm that these GdCoNi samples are single phase.

Courses Taken

Quantum Theory of Interacting particles (4th year undergraduate module)

DST module 2:Properties and Charaterisation of Materials

Teaching Duties

Demonstrator and marker in the 2nd year Microelectronics Laboratory, PX271.

Address:

Amy Tedstone
Superconductivity and Magnetism Group (Room P244)
Department of Physics
University of Warwick
Coventry CV4 7AL

E-Mail:

A dot Tedstone at warwick dot ac dot uk

Tel:

+44 (0)24 76