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", AIP Advances 14, 1, 015048, 2024.
[2] Leo Rodriguez, Arjun Sapkota, Jonathan Alvarado, Jitendra Tate, Wilhelmus Geerts, “Computational Modelling of a Triaxial Vibrational Sample Magnetometer”, AIP Advances 14, 2, 025306, 2024.
[3] "Study of Systematic Error in Biaxial Torque, and Magnetic Characterization of Strontium Ferrite", Arjun Sapkota, MSc. Texas State University, August 2024. Thesis.

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 graduated from our Physics MSc program in August 2024 and is currently enrolled in our MSEC program working with Dr. Nathan Satchell. He plans to graduate in August 2024.