Arjun's project page

Magnetic Torque Measurement of hexaferrite/PA-12 composite.

Arjun Sapkota

I am currently working on torque measurement of a 3D printed strontium ferrite sample using the Vibrating Sample Magnetometer (VSM). Torque measurements, are generally seen as a very important type of measurement as they present information on the preferential directions of magnetic materials. Moreover, from torque measurements, the anisotropy constants can be obtained. Magnetic anisotropy (K2) is a basic and crucial property for the characterization of magnetic materials. In this research, the magnetic torque of a strontium ferrite 3D printed sample created using Magnetic field Assisted Additive Manufacturing (MFAAM) was explored using a VSM. Torque-curves were taken from 16-22kOe every 2kOe using a 4.1 mm long sample attached to an 8 mm circular cover glass and mounted on a sample holder. Fourier analysis was used to determine second harmonics from each torque-curve. Anisotropy was determined from the y-intersect of the second harmonic vs 1/H graphs. Torque curves changed with the orientations of the sample revealing a complex anisotropy axis distribution. The easy axis is not perpendicular to the print bed or parallel to the print direction but tilted.

Publications:
[1] Arjun Sapkota, Leo Rodriguez, Binod D.C, Kolton Dieckow, Chandan Howlader, Jitendra Tate, Wilhelmus Geerts, "On the origin of systematic errors in VSM Torque Curves", accepted for publication in AIP Advances, November 22, 2023.
[2] Leo Rodriguez, Arjun Sapkota, Jonathan Alvarado, Jitendra Tate, Wilhelmus Geerts, “Computational Modelling of a Triaxial Vibrational Sample Magnetometer”, accepted for publication in AIP Advances, November 27 2023.

Presentations:
[1] Arjun Sapkota, Leo Rodriguez, Wilhelmus Geerts, jitendra Tate, "Magnetic Torque Measurment of a 3D printed Strontium Ferrite Sample", poster presentation 2023 TXST STEM Conference, March 24 2023, LBJ Student Center, San Marcos, TX.
[2] Arjun Sapkota, Leo Rodriguez, Binod D.C, Kolton Dieckow, Chandan Howlader, Jitendra Tate, Wilhelmus Geerts, "On the origin of systematic errors in VSM Torque Curves", poster presentation MMM-2023 conference, 10/30/2023-11/3/2023, Dallas.
[3] Leo Rodriguez, Arjun Sapkota, Jitendra Tate, Wilhelmus Geerts, “Computational Modelling of a Triaxial Vibrational Sample Magnetometer”, poster presentation MMM-2023 conference, 10/30/2023-11/3/2023, Dallas.

Arjun is a Physics Major and is enrolled in our MSc. program. He plans to graduate in August 2024.