Dr Lalita Saharan
MIET PhD Material Science MSc Nanotechnology BSc Phys(Hons)
The major aspect of Dr Saharan's research work is the theoretical study of the various materials and computational design of the future devices. Dr Saharan's key projects are follows:
Thermoelectronic devices: Thermoelectronic is a class of materials that can convert heat energy directly into electrical energy with the help of thermal energy carried by electrons and holes. Thermoelectric are currently used in application ranging from thermocouple sensors to solar power generators. We are doing the modelling of thermoelectric advanced nanomaterial's for the their application in next generation optoelctronic design for wearable advanced flexible technology (WAFT) together with University of Oxford and University of Southampton.
Heat induced phase change exchange coupled composite media (HIP-ECC): In this project we aim to develop a novel ECC material to be used a magnetic recording media. Which is capable of achieving high areal density by avoiding the super-paramagnetic limit. We investigate new possibility of creating a thermally induced controlled ECC/graded media system, together with University of Manchester and Seagate Technology.
Simulations of Exchange Spring constant thin films for recording media: This project focuses on the simulation of exchange spring media with an in detail discussion of inter- and intra exchange effects at finite temperatures. The work concentrates particularly on how the magnetization reversal process changes as a function of temperature (150 K – 450 K), grain boundary interactions and exchange spring thickness. A key aspect of our proposed work will be to determine energy barriers in the presence of sub-switching fields. This is a vital question for data storage as recorded data must be stable in the presence of stray fields, such as demagnetizing fields from neighbouring bits, external fields or fields from a write head writing an adjacent track (adjacent track erasure).
Spin-torque switching of MRAM cells: In this project we performed micromagnetic modelling of MRAM cells. The aim of the project was to increase the areal density of MRAM cells. One possibility to increase the areal density is to use spin polarized current instead of applied fields to switch the magnetization in MRAMs. But the use of spin-polarized current leads to very high critical switching current densities. In this work we proposed to apply a microwave field along with the spin-polarized current to reduce the critical current density. We showed that by applying a microwave field the critical switching current density can be reduced by a factor of 21% compared to the threshold critical switching current density in the absence of such a field.
A corssectional comparative analysis of different haemodynamic variables: Haemodynamics, morphological and structural factors are believed to play an important role in the formation, growth and rupture of cerebral aneurysms. However, due to lack of well-designed studies in the field, definite evidence is missing. The study was designed to compare the different computed variables for aneurysms of gradually increasing size to establish a statical correlation between the size of an aneurysm and these variables.