(chronologically reversed)

2002(Sept)�Present:

Graduate student at Paul drude Institute and Humboldt-Universit�t zu Berlin, Berlin, Germany.

Ph.D. Specialization: Experimental condensed matter physics,

Dissertation: Ferromagnetic thin films of Fe and Fe₃Si films on low-symmetric GaAs(113)A substrates (electronic copy available on request).

Advisor: Prof. Dr. Klaus. H. Ploog

Projected Graduation Date: Dec 2005, (thesis submitted)

My PhD thesis is a part of the Humboldt graduate school on �Fundamentals and functionality of size and interface controlled materials: spin-and optoelectronics�

Also see the non-official page at:

http://www.physik.hu-berlin.de/~pomraenk/graduate/index

2002(Jan)�2002(Aug):

Junior research fellow in the department of Physics, Indian Institute of Technology (I.I.T) Kharagpur. 

2000(July)�2002(Jan):

 M.Tech (Master of Technology) in Materials Science and Engineering with semiconductor technology as specialization from Indian Institute of Technology (I.I.T) Kharagpur, India.

Courses: Optoelectronics Materials and devices, Semiconductor devices and Modelling, Crystal Growth and Characterization, Semiconductor Technology, Thin Film Technology, CAD for VLSI

Project: �Study of Silicon carbide based Schottky junctions for hydrogen Gas sensor applications�

Duration: 8 months

Supervisors: Prof S Basu and Dr C Jacob

Over all GPA: 8.84/10

1998(July)�2000(July):

M.Sc (Master of Science) in Physics with Electronics and Instrumentation as Specialization from Utkal University, Bhubaneswar, Orissa, India.  

Courses: Solid state physics, Quantum mechanics (Basic and Advanced), Electrodynamics, Electronics, Classical Mechanics, Optics (physical and geometrical), Mathematical methods, Nuclear and atomic physics.

Marks obtained: 74 %, Rank: Six (In the University) 

1995(July)-1998(July): 

B.Sc (Bachelor of Science) in Physics as Honors from Sambalpur University, Sambalpur, Orissa, India.  

Marks obtained: 71.625% Rank: Six (In the University, Out of around 2000 students)

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Scholarships and Achievements

• Doctoral fellowship granted by the Paul-Drude-Insitute for Solid State Electronics, Berlin, Germany
• Postgraduate scholarship during M.Tech at IIT Kharagpur, Govt. Of India
• Qualified the prestigious national level examination, Graduate Aptitude Test For engineering (GATE)-2000 with 97.84 percentile, All India Rank: 34 (out of 1600 students appeared)
• Qualified CSIR �NET JRF (Junior Research Fellowship in Physics) held during June 2000. I was among top 30 students in the National eligibility Test (NET), Approximately 9000 students appeared in this national test.
• Ranked 6^th in Master of Science (Physics), from Utkal University, India ,1998-2000.
• National Scholarship by Government of India, for securing 6th rank (out of around 2000 students) in Bachelor of Science (B.Sc) with Physics.
• Qualified TOFEL (Test of English as a Foreign Language)-2002 with a score of 233/300

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Research Experience

The present research leading to PhD involves the growth and properties of ferromagnets on semiconductor substrates. The work deals with three important aspects: (i) growth and structural characterization, (ii) magnetic properties, and (iii) magnetotransport properties of Fe and Fe₃Si films on low-symmetric GaAs(113)A substrates. These two ferromagnetic metals, namely Fe and Fe₃Si have cubic crystal structure and exhibit a close lattice match with GaAs. This allows to stabilize the [113]-orientation of the films on GaAs(113)A by using molecular-beam epitaxy (MBE). The structural properties of the Fe and Fe₃Si films are studied using techniques such as reflection high-energy electron diffraction (RHEED), high-resolution X-ray diffraction (HXRD), X-Ray Reflectivity (XRR), and Atomic force microscopy (AFM). The magnetic properties are studied by in-situ Magneto-optical Kerr effect, SQUID magnetometry, and different magnetotrantranport techniques such as anisotropic magnetoresistance, planar Hall effect (PHE) and anomalous Hall effect.  The basic achievements of this work include the following: (i) establishment of the growth of Fe and Fe₃Si on the high-index surface of GaAs(113)A substrates by MBE, (ii) study of the magnetic properties on the low-symmetric surface, which also provide the understanding to the incompletely understood uniaxial magnetic anisotropy (UMA) of Fe/GaAs system, (iii) substantiate correlation between structural and magnetic properties, and (iv) an important finding of an antisymmetric component in the PHE due to the reduced symmetry of the [113] orientation, (v) development of a phenomenological model based on the symmetry of the crystal  to understood the understand the observation of the antisymmetric component in PHE. The antisymmetric component in PHE is a completely new observation and to our knowledge is a first observation of the second-order Hall effect.

For details of the present research activity please see the research page and Publications

Previous Research Experiences:

1) Master of Technology ( M.Tech): Project on �Study of Silicon carbide based Schottky junctions for hydrogen Gas sensor applications�

Duration: 8 months

Supervisors: Prof S Basu and Dr C Jacob

During this project work, polycrystalline and bulk 3C-SiC samples were used to fabricate Ru/3C-SiC Schottky junctions for hydrogen gas sensor applications. The deposition of Ru was performed in e-beam evaporator and preliminary structural properties were characterized with XRD, resistivity, and Hall effect measurements. A homemade senor set-up was used to perform preliminary studies on the sensor properties of the Schottky junctions. An increase in diode current was observed with H₂ concentration. Sensitivity was found to increase with biasing voltage. More details can be found in the above thesis.

Part of this work was also presented at the 9^th International meeting on chemical sensors, Boston, USA, S Basu, S Roy, P K Muduli, C Jacob, A K Tyagi, High Temperature Hydrogen Sensors based on 3C-SiC Bulk and epilayer

2) M.Sc Summer project on �Plasma Paste Boronizing of stainless steel: A novel technique to improve hardness of metal surface� See the annual publication in Blossom here

This was my first experience in a real experimental environment. I got flavor of some plasma processing techniques. Also some preliminary studies of surface hardness was performed.

 Duration: 1.5 months

Seminars delivered

During Ph.D:

• An overview of MOKE and SQUID magnetic measurement Techniques Zip Archive (264K)
• Taking spin into account [PDF]
• An introduction to programming in Origin html
• Growth and Magnetic properties of Fe on GaAs (311)A substrates: PDF
• Growth, structure and magnetism of Fe and Fe₃Si films on GaAs(113)A substrates. [PDF]

During M.Tech:

•  �Growth and Characterization of Si_1-x-yGe_x C_y epilayer on Si substrates�

• �A Ferroelectric memory field effect transistor (FEMFET) using Metal/PZT/MgO/SiO₂ structure�

• �Blue GaN-InGaN MQW LED on Silicon Substrate�

• �An Overview of Silicon Carbide Technology�

Experimental Skills:

Samples preparation

• Growth of magnetic thin films and preparation of III-V semiconductor surfaces by molecular-beam Epitaxy***

• Growth of metals on SiC by e-beam evaporation**

Structural characterization

• Reflection high-energy electron diffraction***

• High resolution X - Ray Diffraction (HXRD) and X-Ray Reflectivity (XRR) with PANalytical high-resolution diffractometer, High-resolution Bede Diffractometer and a Home made XRD system***

• Atomic force microscopy (Park scientific and digital instruments nanoscope) ***

• Scanning Electron Microscopy*

Magnetic Characterization

• SQUID magnetometry with MPMS XL***

• Magneto-optical Kerr effect**

• Magnetotrantranport and Hall effect (anamolous) ***

• Magnetic force Microscopy*

(* indicates level of experience, 3 * for highest)

Other Skills:

 Computer Knowledge:

• Programming Languages: C, FORTRAN, VHDL

• Operating Systems: Windows, Linux, Unix 

•  Software expertise: Latex, MS Office, Origin (with knowledge of programming),  Igor Pro (with knowledge of programming), Mathmatica, MATLAB, Crystal drawing programs such a Diamond, Several X-ray simulation Softwares, little knowledge of VLSI Design TOOLS such as circuit simulation by Win- SPICE, T-SPICE and Digital Logic synthesis using SYNOPSYS

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Personal Details

Nationality: INDIAN

Date of Birth: 01-11-1978

Place of birth: Orissa, India

Sex: Male

Marital status: Single

Personal Address:

Paul-Drude-Institute for Solid State Electronics , Hausvogteiplatz 5-7, 10117 Berlin, Germany
Tel: 0049-30-20377-364,362 (Office, Lab), Fax: 0049-(0)30-20377-201, Mobile: 0049-1797675814, 0049-30-25019329
Email: [email protected]/[email protected]

Home Address:

Apartment No:61502, LynarStr.5, 13353, Berlin, Germany, Mobile: 0049-1797675814, 0049-30-25019329

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