Sara MAHIDDINE

I hold two MSc. degree in physics one in condensed matter & nanophysics another in material physics & nanoscience, great curiosity, serious, good aptitude for experimental work, strong interest in interdisciplinary research :

1/3/2014 - 31/8/2014: UCL Healthcare Biomagnetic and NanomaterialsLaboratories, London W1S 4BS, UK
I studied superparamagnetic nanoparticles and their biomedical application :
Design, synthesis and characterization of nanoparticles using DLS, SQUID, TEM, XRD)
Biofunctionalisation of NPs
I am working with different reducing agent and I am writing a paper on my results.

I am the co-author of the manuscript : Mecanisms of Nucleation and Growth of Nanoparticles in Solution (Chemical Reviews (Impact Factor: 41.3). 07/2014; DOI: 10.1021/cr400544s).

25/02/2013-31/07/2013: IPCMS - Department of Surfaces and Interfaces (DSI), 67034 STRASBOURG CEDEX 2 FRANCE
I studied the effect of organic thin films deposited on ferromagnetic films on spin-polarized electrons both in reflection and transmission geometry. I could show that the presence of organic molecules has a strong effect on the exchange asymmetry in reflection, while electrons in transmission are not significantly influenced. These results are now part of a manuscript published in:PHYSICAL REVIEW B 89, 134411 (2014) DOI: 10.1103/PhysRevB.89.134411)

11/2012-01/2013: tutorial project on computational physics, IPCMS-Department of Magnetic Objects on the NanoScale(DMONS), Strasbourg, France
Calculated low-spin high-spin crossover in Fe(phen)2(NCS)2 molecule:
We used the VASP method and several approximations to determine numerically the physical properties of the iron atom of the Fe(phen)2(NCS)2 molecule. The comparison of the computations results with the experimental values show that the GGA+U approximation is the most relevant one. It enables us to compute by the most accurate way the different properties of the iron atom. We also proved that the space orientation of the molecule ( rotation code (C language)) does not influence these properties.

03/2012-06/2012: IPCMS-Department of Magnetic Objects on the NanoScale(DMONS), Strasbourg, France
Characterization of surfaces Fe (phen)2(NCS)2 /Cu(100) by Scanning Probe Microscopy (AFM, STM)

03/2011-06/2011: IPCMS-Department of Magnetic Objects on the NanoScale(DMONS), Strasbourg, France
Structure and magnetism of multilayer(Co/Mg) supermirrors (RMN and Kerr measurements:
The modulation of the polarization state of light is used by placing a photo-elastic modulator in the optical assembly. The modulator consists of a silica rod subjected to an alternating pressure f = 50.8 kHz using a piezoelectric transducer excited at the resonant frequency of the bar. This results in a pressure modulated and linear birefringence allows the change of the polarization of the laser beam linear to elliptical.
The light detector placed at the end of the optical assembly is a photodiode. It enables the acquisition of the continuous intensity I0 and the intensity modulated at frequency f and 2f, I (ω) and I (2ω).
The originality of this device lies in the acquisition of the hysteresis loop of rotation and ellipticity at the same time. Apart form the cycle, we have access to as well as the coercive fierld, the remanent magnetization and saturation magnetization. My job was to study the effect of different annealing temperatures of samples in their magneto-optical properties
It is noted that the coercive field (Hc) vary depending on the annealing temperature that is to say a change in the hardness of the ferromagnetic material. Relatively high reflectivity, which is due to the majorité of the interface is planar.


Mes compétences :
Microsoft Office
Linux
FORTRAN
C Programming Language
Vasp code
Ultra High vacum setup

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