English
BIOGRAPHICAL SKETCH:
Seno Aji, Ph.D.
Email Address : senji77@sci.ui.ac.id, seno.aji03@ui.ac.id, senji77@gmail.com
About
2009 – 2013 : Universitas Indonesia, Faculty of Science, Department of Physics, Undergraduate Program of Physics, Indonesia
2015 – 2017 : Tohoku University, Graduate School of Science, Department of Physics, Master Program of Physics, Japan
2017 – 2020 : Tohoku University, Graduate School of Science, Department of Physics, Doctoral Program of Physics, Japan
Undergraduate thesis: “Calculations employing 8 k.p bands for the magnetic and electronic properties of ZnO doped with transition metal elements within the Dynamical Mean Field Theory”, in Theoretical Condensed Matter Physics (TCMP) group, supervised by M. Aziz Majidi, Ph.D.
Master’s thesis: “Effects of Rashba-type spin-orbit interaction on magnetic property in double-exchange model”, in Theoretical Condensed Matter Physics (TCMP) group, supervised by Prof. Sumio Ishihara.
Doctoral thesis: “Magnetic Properties and Spin Excitations in Skyrmion Lattice Phase of the Itinerant Chiral Magnet MnSi1−xGex”, in Quantum Spin Physics Laboratory (Experimental group), supervised by Prof. Taku J Sato.
2009 – 2013 : PPA Scholarship from DIKTI
2015 – 2020 : Japanese Government (MEXT) Scholarship
2023 – Present: Lecturer and Researcher, Department of Physics, Universitas Indonesia
2021 – 2023 : Postdoctoral Researcher, Institute for Solid State Physics (ISSP), The University of Tokyo, Japan
2018 – 2019 : Teaching Assistant at Statistical Physics Exercise II Class, Graduate School of Science, Tohoku University, Japan
Finding a new magnetic skyrmion-hosting material, Topological spin textures and magnon bands, Magnetic and transport phenomena, Novel superconductors, and Quantum magnetism in low dimensional and frustrated magnet.
Computational Physics:
- Mean Field analysis
- Diagonalization method
- Monte Carlo simulation for large degree of freedom of classical spins system
- Landau-Lifshitz-Gilbert equation and Langevin dynamics to study non-equilibrium spin dynamics at zero and finite temperatures
- Spin-wave analysis for magnetic skyrmion lattice system
- Analytical calculation for chiral spins model
- Programming language for numerical method: Fortran, Python, Julia
- Plotting program: gnuplot, xmgrace
Experimental Physics:
- Polycrystalline sample using Arc- and RF (induction furnace) melting method
- Single crystal growth using Bridgmann Furnace
- X-ray powder diffraction experiment
- 4-circle X-ray diffraction for single crystal
- Laue diffraction experiment
- Scanning Electron Microscopy and Electron Dispersive X-ray for the crystal composition analysis
- Magnetization measurement using superconducting-quantum interference-device (SQUID) magnetometer (Quantum Design MPMS-XL5)
- Elastic and inelastic neutron scattering experiments:
- Cold neutron triple axis spectrometer at SIKA, ANSTO, Australia
- Small angle neutron scattering (SANS) at QUOKKA, ANSTO, Australia
- Cold neutron triple-axis spectrometer at CTAX, ORNL, USA
- Polarized and unpolarized neutron scattering at PONTA (5G), JRR-3, Japan
- High-resolution chopper spectrometer experiment at HRC (BL12), J-PARC, Japan
- MIEZE-type neutron spin echo experiment at VIN ROSE (BL06), J-PARC, Japan
Publications
- S. Akatsuka, S. Esser, S. Okumura, R. Yambe, R. Yamada, M. M. Hirschmann, S. Aji, J. S. White, S. Gao, Y. Onuki, T. Arima, T. Nakajima, and M. Hirschberger, Non-coplanar helimagnetism in the layered van-der-Waals metal DyTe, Nat. Commun. 15, 4291 (2024).
- S. Aji, T. Oda, Y. Fujishiro, N. Kanazawa, H. Saito, H. Endo, M. Hino, S. Itoh, T. Arima, Y. Tokura, and T. Nakajima, Direct observations of spin fluctuations in hedgehog–anti-hedgehog spin lattice states in MnSi1−xGex (x=0.6 and 0.8) at zero magnetic field, Phys. Rev. B 108, 054445 (2023).
- C. Chaffey, H. C. Wu, Hanshang Jin, P. Sherpa, Peter Klavins, M. Avdeev, S. Aji, R. Shimodate, K. Nawa, T. J. Sato, V. Taufour, and N. J. Curro, Magnetic structure and Kondo lattice behavior in CeVGe3: An NMR and neutron scattering study, Phys. Rev. B 108, 115163 (2023).
- D. Reim, S. Matsuzaka, K. Makino, S. Aji, R. Murasaki, D. Higashi, D. Okuyama, Y. Nambu, E. P. Gilbert, N. Booth, S. Seki, Y. Tokura, and T. J. Sato, Higher-order modulations in the skyrmion-lattice phase of Cu2OSeO3, Phys. Rev. B 106, 104406 (2022).
- S . Aji, H. Ishida, D . Okuyama, K. Nawa, T. Hong, and T. J. Sato, Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi, Phys. Rev. Mater. 3, 104408 (2019).
- S. Aji, T. Oda, Y. Fujishiro, N. Kanazawa, H. Saito, H. Endo, M. Hino, S. Itoh, T. Arima, Y. Tokura, and T. Nakajima, Spin fluctuations in spin-hedgehog-anti-hedgehog lattice states in Mn(Si,Ge) in zero magnetic field, Oral presentation, Japanese Society for Neutron Science (JSNS) meeting, Chiba, Japan (2022).
- S. Aji, T. Oda, Y. Fujishiro, N. Kanazawa, H. Saito, H. Endo, M. Hino, S. Itoh, T. Arima, Y. Tokura, and T. Nakajima, Spin fluctuations in spin-hedgehog-anti-hedgehog lattice states in Mn(Si,Ge) in zero magnetic field, Oral presentation, Japan physical society (JPS) meeting, Tokyo, Japan (2022).
- S. Aji, D. Okuyama, K. Nawa, S. Yano, and T. J. Sato, Low-energy magnetic excitations in the skyrmion lattice phase of MnSi, Oral presentation, Japan physical society (JPS) meeting, Nagoya, Japan (2020).
- S. Aji, H. Ishida, D. Okuyama, K. Nawa, T. Hong, S. Yano, and T. J. Sato, Magnetic Properties in the Itinerant Chiral Magnet Mn, Poster presentation, The 2nd edition of international symposium of CEFMS-NCTU, RCAS-AS (Taiwan) and 5-star Alliance (Japan) [2nd (5+2) joint symposium], Sendai, Japan (2019).
- S. Aji, H. Ishida, D. Okuyama, K. Nawa, T. Hong, S. Yano, and T. J. Sato, Magnetic Properties in the Itinerant Chiral Magnet MnSi1-xGex, Poster presentation, International conference on strongly correlated electron systems (SCES), Okayama, Japan (2019).
- S. Aji, H. Ishida, D. Okuyama, K. Nawa, T. Hong, and T. J. Sato, Magnetic properties in the Itinerant chiral magnet MnSi1-xGex, Oral presentation, Japan physical society (JPS) meeting, Kyushu, Japan (2019).