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Thin Films and Nanostructures
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Thin Films and Nanostructures

Mr Richard Dawidek

Project

Emergent Domain Wall Behaviour In Interconnected Nano Ring Arrays

Abstract

This project investigates emergence arising from domain wall interactions at junctions between connected nano rings. The DW population of arrays can be analytically modelled against the probability of interactions occurring. Methods to measure the magnetisation of the array (itself linked to domain wall population) are used to experimentally interrogate the population as interaction probability variables are changed.

It is hoped that emergent behaviour could be harnessed for non-Von Neumann computing methods, such as reservoir computing.

Supervisors

Professor Dan Allwood and Dr Tom Hayward

Funded by the Engineering Physical Sciences Research Council

Mr Tom Broomhall

Project

Suppression of Stochastic Domain Wall Pinning Through Modified Gilbert Damping

Abstract

Within this project the stochastic behaviour of domain walls interacting at pinning sites within soft-ferromagnetic nanowires is investigated. Domain walls, when moved by the application of external fields can undergo changes in their configuration. This changing structure can give rise to different responses at a pinning site, more possible structures gives more possible outputs. However, in technologies which require known outputs, such as domain wall logic, these multiple pinned states are detrimental.

To overcome this problem, it has been proposed that by doping soft-ferromagnetic nanowires with small amounts of Rare Earth elements can suppress the changing structure of a domain wall during propagation and therefore give singular responses at a pinning site.

Supervisors

Professor Dan Allwood and Dr Tom Hayward

Funded by the Engineering Physical Sciences Research Council

Mr Alaa Alasadi

Project

 

Abstract

 

Supervisors

 

Funded by the...

Mr Qayes Al-dulaim

Project

Studying The Effect of Growth Parameters On Magnetostrictive Amorphous Thin Films And Study The Mechanical Properties By Nanoindentation

Abstract

Magnetostrictive amorphous thin films are being developed for a wide range of MEMS applications, including strain sensors and magnetostrictive actuators. To achieve the sensitivities required for these applications the magnetic films used have to possess a large magnetostriction constant (>50ppm) and a small anisotropy field (<10kA/m). The work presented here investigates magnetostrictive amorphous thin films, including FeSiB and FeGaSiB films, to achieve these required parameters. A co-sputtering – evaporation deposition technique was used to fabricate the films, which allows control of the Ga percentage within the films. The films were grown on the silicon (100) substrates. The effect of changing the growth parameters including the sputtering power, the chamber pressure and the Ga evaporation rate were studied to determine their influence on the structural, magnetic and magnetostriction properties of these amorphous films. While the magnetic properties (coercive and anisotropy field and magnetostriction constant) were measured on a Magneto-optical Kerr effect (MOKE) magnetometer. A VSM was used to measure the magnetisation of films. A bending tool was used to strain the films via the Villari Effect. The mechanical properties were studied by nanoindentation technique.

Supervisors

Dr Nicola Morley and Dr Tom Hayward

Funded by The Iraqi Ministry of Higher Education & Scientific Research (MOHESR)  

Mrs Saturi Baco

Project

Soft Magnetostrictive Properties of FeCoCr Thin Film

Abstract

This project are to investigate the magnetic, structure and mechanical properties of FeCo thin films alloying with different Cr at.% which aims to obtain high magnetostriction with soft magnetic properties (low coercive and anisotropy fields). These properties will be determined by means of XRD, AFM, SEM-EDX, Nano-indentation, High Field Moke and Villari technique.

Supervisors

Dr Nicola Morley and Dr Tom Hayward

Funded by the Ministry of Higher Education, MALAYSIA

http://magnetics.group.shef.ac.uk/page.php?id=29