Project Page Shankar Acharya

Shankar Acharya: Dual Moke technique.

Dual Moke Setup based on modulated ellipsometry.

Shankar

Shankar Acharya.

Texas State University at San Marcos, Department of Physics, RFM 2225, 601 University Drive, San Marcos, TX78666.

A dual beam magneto-optical setup employing a single axis photo-elastic modulator was designed and constructed. The beam transmitted through or reflected of the sample is split by a Wollaston prism in two orthogonal high-quality linearly polarized beams. The intensity of both beams is measured by two similar Silicon photodetectors. Lock in amplifiers and dc multimeters are used to measure the 2 omega and dc signals. Preliminary measurements taken at a retardation depth of 2.256 radians show that the PEM interference effect is suppressed in the difference 2 omega signal while the MOKE contribution to the 2 omega ignal is doubled.

Publications:

[1] Binod D.C., Andres Oliva, Anival Ayala, Shankar Acharya, Fidele Twagirayezu, James Nick Talbert, Luisa M. Scolfaro, Wilhelmus J. Geerts, “Magnetic Properties of reactive co-sputtered NiFe-oxide samples”, August 13, 2018, 6 page paper published in IEEE Trans. on Magn., DOI: 10.1109/TMAG.2018.2866788
[2] Shankar Acharya, Dual Beam Detection Technique to Study Magneto-Optical Kerr effect , thesis Texas State University, San Marcos, May 2019 (thesis).
[3] Shankar Acharya, Brian Collier, Wilhelmus J. Geerts, Dual Beam Modulated Magneto-Optical Measurement Setup, accepted for publication in Review of Scientific Instruments (December 2019).

Presentations/Posters:

[4] Shankar Acharya, Brian Collier, Abdul Ahad Talukder, Wilhelmus J. Geerts, “ Dual Beam MOKE Detection to Suppress the Effect of Modulated Interference Effects in PEM”, Oral presentation 2018-TSAPS spring meeting at Tarleton State University in Stephenville, March 23 2018.
[5] Shankar Acharya, Brian Collier, Md. Abdul Ahad Talukder, Wilhelmus Geerts, “Dual Beam Modulated Magneto-Optical Measurement Setup”, poster presentation International Conference on Magnetism 2018, July 19, 2018, San Francisco.
[6] Binod D.C., Andres Oliva, Anival Ayala, Shankar Acharya, Fidele Twagirayezu, James Nick Talbert, Luisa Scolfaro, Wilhelmus Geerts, “Magnetic Properties of reactive sputtered NiFe-oxide samples”, International Conference on Magnetism 2018, July 18, San Francisco.
[7] D. C. Binod, Andres Oliva, Anival Ayala, Shankar Acharya, Fidele Twagirayezu, James Talbert, Luisa Scolfaro, Wilhelmus Geerts, “VSM measurements on NiFe-oxide samples”, poster presentation at the Spring-2018 TSAPS meeting at Tarleton State University in Stephenville, march 23, 2018.
[8] Shankar Acharya, Mariah Chappell, Mayuko Stauffeneger, Wilhelmus Geerts, “Study of different oxide concentrated Nickel oxide thin films using Scanning Probe microscopy”, oral presentation ninth international research conference for graduate students, Texas State University San Marcos, November 8, 2017.

Shankar graduated in Spring 2019 and is currently employed for NXP.