Leo's project page

True Vector magnetometry.

Leo Rodriguez

Triaxial VSM coilsets are designed and being realized for two different VSMs: (1) MicroSense EZ9 VSM; (2) Quantum Design PPMS VSM insert. Mathematica is used to design the coils and calculate its theoterical sensitivity and cross-talk. For the EZ9 vertical z-coils seem to have the largest sensitivity and can be raised up from the bottom around sample holder and sample. Spools are 3D printed and are positioned over a thin wall brass tube and attached to a optical mechanical stage positioned under the electromagnet that allows for XYZ and three angles to be adjusted. The setup is tested on MFAAM 3D printed magnetic composites, NiFe-oxide and NiFe-hydroxide composites, and Fe-doped Ga₂O₃ thin film samples.

Publications:
[1] Leo Rodriguez, Arjun Sapkota, Jonathan Alvarado , Jitendra Tate, Wilhelmus Geerts, “Computational Modelling of a Triaxial Vibrational Sample Magnetometer”, AIP Advances 14, 2, 025306, 2024, Computational modelling of a triaxial vibrating sample magnetometer | AIP Advances | AIP Publishing (impact factor 1.697).
[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", aAIP Advances 14, 1, 015048, 2024, On the origin of systematic errors in VSM torque curves | AIP Advances | AIP Publishing (impact factor 1.697).

Presentations:
[1] Leo Rodriguez, Eric Welch, Alex Zakhidov, “Ab Initio Computer Modeling of Surface Polarons in Halide Perovskites, Symposium C7, virtual poster presentation XXIX International Materials Research Congress, MRS meeting Cancun, August 2021.
[2] Leo Rodriguez, Luisa Scolfaro, Mark Wistey, Eric Welch, Wim Geerts, “Ab initio Computational Modeling of Surface Supercells of Halide Perovskites”, Graduate Student Research Conference, April 4, 2023, San Marcos, TX.
[3] 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.
[4] 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.
[5] 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.

LEO is a PhD. student enrolled in TxState's MSEC program. He plans to graduate in May 2026.