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Dr. rer. nat. Matthias Opel

Photo von Dr. rer. nat. Matthias Opel.
Phone
+49 89 289-14237
Room
E-Mail
matthias.opel@mytum.de
Links
Homepage
Page in TUMonline
Group
Technical Physics
Additional Info
Zimmer 135 (1. OG)

Courses and Dates

Offered Bachelor’s or Master’s Theses Topics

Durchstimmung der Amplitude des Spin-Hall-Magnetwiderstands

The exchange of spin angular momentum between the localized magnetic moments of a magnetically ordered insulator and the spin polarization of the conduction electrons in an adjacent metallic electrode with large spin-orbit coupling gives rise to interfacial spin mixing. This manifests itself as a characteristic angular dependence of the metal’s resistivity on the magnetization direction of the insulator’s magnetic sublattices, denoted as “spin Hall magnetoresistance (SMR)”. The effect was first observed in ferrimagnetic Y3Fe5O12/Pt thin film heterostructures and recently also reported in antiferromagnetic NiO/Pt and α-Fe2O3/Pt. While the phase of the SMR oscillations is well understood and explained by theory, their amplitude, however, is still a matter of debate, since various extrinsic as well as intrinsic parameters play a crucial role. The goal of this master’s thesis is to study the correlation of the SMR amplitude to the density of magnetic ions and their spin magnetic moments in different magnetically ordered insulating oxides.

We are looking for a master student interested in thin film technology for the fabrication and investigation of magnetic insulator/normal metal bilayer structures. The master project will provide a comprehensive introduction into laser molecular beam epitaxy (laser-MBE) as well as electron beam physical vapor deposition, high-resolution X-ray diffraction (HRXRD), atomic force microscopy (AFM), superconducting quantum interference device (SQUID) magnetometry, photolithography, and angle-dependent magnetotransport measurements.

suitable as
  • Bachelor’s Thesis Physics
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Oxidische Heterostrukturen für Experimente mit reinen Spinströmen

Pure spin currents are generated and/or detected via the spin Hall and inverse spin Hall effect in heavy metals. These two effects crucially depend on the magnitude of the spin-orbit interaction. The goal of this thesis is to investigate the spin Hall physics in oxide systems, where large spin orbit interaction is prevailing like in the transition metal oxides. In particular, the realization of epitaxial multilayers of a spin Hall active material and a magnetically ordered insulator are a major task of this research project. Such all-oxide epitaxial structures are of current interest to better understand the underlying physics of pure spin current transport in heterostructures.

We are looking for an enthusiastic master student to work on this pure spin current physics related project. A crucial part of the thesis is the growth of oxide multilayers using laser-MBE under in-situ growth monitoring. The properties of these multilayers will then be investigated by structural, magnetic and magnetotransport techniques. As a next step, the tunability of relevant spin transport properties via the growth conditions will be analyzed

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross

Publications

Surface distortion of Fe dot-decorated TiO2 nanotubular templates using time-of-flight grazing incidence small angle scattering
Neelima Paul (author), Jean-Francóis Moulin (author), Gaetano Mangiapia (author), Armin Kriele (author), Peter Müller-Buschbaum (author), Matthias Opel (author), Amitesh Paul (author)
2020-12
journal article
Scientific Reports
URL: https://doi.org/10.1038/s41598-020-60899-2
DOI: 10.1038/s41598-020-60899-2
Self-Assembly of Large Magnetic Nanoparticles in Ultrahigh Molecular Weight Linear Diblock Copolymer Films
2020-2-12
journal article
ACS Applied Materials & Interfaces
URL: http://dx.doi.org/10.1021/acsami.9b20905
DOI: 10.1021/acsami.9b20905
ISSN: 1944-8244
ISSN: 1944-8252
Large Spin Hall Magnetoresistance in Antiferromagnetic α−Fe2O3/Pt Heterostructures
Johanna Fischer (author), Matthias Althammer (author), Nynke Vlietstra (author), Hans Huebl (author), Sebastian T.B. Goennenwein (author), Rudolf Gross (author), Stephan Geprägs (author), Matthias Opel (author)
2020-1-13
journal article
Physical Review Applied
URL: https://doi.org/10.1103/PhysRevApplied.13.014019
DOI: 10.1103/PhysRevApplied.13.014019
Spray-Coating Magnetic Thin Hybrid Films of PS-b-PNIPAM and Magnetite Nanoparticles
2019
journal article
Advanced Functional Materials
URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201808427
DOI: 10.1002/adfm.201808427
Improving the modelling of susceptibility-induced spatial distortions in MRI-guided extra-cranial radiotherapy
C Kroll (author), O Dietrich (author), J Bortfeldt (author), C Paganelli (author), G Baroni (author), F Kamp (author), S Neppl (author), C Belka (author), K Parodi (author), M Opel (author), M Riboldi (author)
2019-10-10
journal article
Physics in Medicine & Biology
URL: https://doi.org/10.1088/1361-6560/ab447c
DOI: 10.1088/1361-6560/ab447c
Role of interface quality for the spin Hall magnetoresistance in nickel ferrite thin films with bulk-like magnetic properties
Matthias Althammer (author), Amit Vikram Singh (author), Tobias Wimmer (author), Zbigniew Galazka (author), Hans Huebl (author), Matthias Opel (author), Rudolf Gross (author), Arunava Gupta (author)
2019-8-26
journal article
Applied Physics Letters
URL: https://doi.org/10.1063/1.5097600
DOI: 10.1063/1.5097600
Magnetic excitations and amplitude fluctuations in insulating cuprates
2018
journal article
Phys. Rev. B
URL: https://link.aps.org/doi/10.1103/PhysRevB.97.024407
DOI: 10.1103/PhysRevB.97.024407
Magnetic excitations and amplitude fluctuations in insulating cuprates
T. Böhm, R. Hackl, L. Forró, H. Berger, A. Erb, L. Tassini, F. Venturini, M. Opel, A. Baum, N. Chelwani
2018
journal article
Physical Review B
URL: https://publons.com/publon/10002002/
DOI: 10.1103/PHYSREVB.97.024407
WOSUID: WOS:000419614300004
Magnetic nanoparticle-containing soft–hard diblock copolymer films with high order
Peter Müller-Buschbaum, Stephan V. Roth, Matthias Schwartzkopf, Matthias Opel, Volker Körstgens, Senlin Xia, Lin Song
2018
journal article
Nanoscale
URL: https://publons.com/publon/10002007/
DOI: 10.1039/C8NR02760A
WOSUID: WOS:000437761500024
Magnetic nanoparticle-containing soft–hard diblock copolymer films with high order
Senlin Xia (author), Lin Song (author), Volker Körstgens (author), Matthias Opel (author), Matthias Schwartzkopf (author), Stephan V. Roth (author), Peter Müller-Buschbaum (author)
2018
journal article
Nanoscale
URL: https://doi.org/10.1039/C8NR02760A
DOI: 10.1039/C8NR02760A

further publications (total of 179).

See ORCID profile of Matthias Opel as well.

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