Contact

Dr. Kilian Lenz

Research Group Head
Magnetization Dynamics
k.lenzAthzdr.de
Phone: +49 351 260 2435

Research and Projects on Magnetization Dynamics and Nanomagnetism

Research group Dr. Kilian Lenz

Gruppenbild FWIN-D ©Copyright: Dr. Lenz, Kilian

People:

NameBld./Office+49 351 260EmailPosition/Tasks
Dr. Kilian Lenz712/3042435
k.lenzAthzdr.deResearch Group Head
Antje Oelschlägela.oelschlaegelAthzdr.de

Other employees

NameBld./Office+49 351 260EmailPosition/Tasks
Dr. Rysard Narkovic801/P1242459
r.narkovicAthzdr.deEngineer

Description:

The research topics of work group covers both the static magnetic properties (e.g. magnetization, anisotropy, coercivity, interlayer exchange coupling) as well as dynamic properties like, linewidth and precessional damping effects, spin-torque effects, etc.

The investigations are caried out using ferromagnetic resonance (FMR), magnetooptical Kerr effect (MOKE), and SQUID magnetometry. Details of the setups can be found here.


Projects:


Magnetization Dynamics of an Individual Single‐Crystalline Fe‐Filled Carbon Nanotube

Micromanipulation eines FeCNT in einen Mikroresonator ©Copyright: Dr. Lenz, Kilian

The magnetization dynamics of a single crystalline Fe‐filled multiwall carbon nanotube (FeCNT) are investigated by microresonator ferromagnetic resonance and Brillouin light scattering. Using a focused ion beam the initial FeCNT is successively shortened to obtain a single‐crystalline Fe wire. The cubic anisotropy and very narrow linewidth prove the high quality of the Fe nanowires.

Kilian Lenz et al., Small 201904315

Editors' suggestion:
Spin-wave modes in transition from a thin film to a full magnonic crystal

Multistep Etching Teaser from PRB ©Copyright: Manuel Langer

Standing spin waves in thin films with a tiny periodic surface modulation are quantized in such a way that a multiple of their wavelength fits into one modulation period. This paper tackles the question how these film modes evolve into modes in a one-dimensional magnonic crystal consisting of periodic individual wire structures. By sequentially increasing the surface modulation and subsequent dynamic characterization of the same sample, simple transition rules are found connecting the modes of both systems with one another.
M. Langer et al. Phys. Rev. B 99, 024426 (2019)


Recent Publications:

complete list of publications...

Magnetization Dynamics of an Individual Single-Crystalline Fe-Filled Carbon Nanotube
K. Lenz, R. Narkowicz, K. Wagner, C. F. Reiche, J. Körner, T. Schneider, A. Kákay, H. Schultheiss, U. Weissker, D. Wolf, D. Suter, B. Büchner, J. Fassbender, Th. Mühl, J. Lindner
Small 201904315 (2019)

Reconfigurable spin-wave non-reciprocity induced by dipolar interaction in a coupled ferromagnetic bilayer
R. A. Gallardo, T. Schneider, A. K. Chaurasiya, A. Oelschlägel, S. S. P. K. Arekapudi, A. Roldáan-Molina, R. Hübner, K. Lenz, A. Barman, J. Fassbender, J. Lindner, O. Hellwig, P. Landeros
Phys. Rev. Appl. 12, 034012 (2019)

Spin-wave nonreciprocity on magnetization-graded ferromagnetic films
R. A. Gallardo, P. Alvarado-Seguel, T. Schneider, C. Gonzalez-Fuentes, A. Roldán-Molina, K. Lenz, J. Lindner, P. Landeros
New J. Phys. 21, 033026 (2019)

Tuning Ferromagnetic Resonance via Disorder/Order Interfaces
T. Schneider, K. Lenz, A. Semisalova, J. Gollwitzer, J. Heitler-Klevans, K. Potzger, J. Fassbender, J. Lindner, R. Bali
J. Appl. Phys. 125, 195302 (2019)

Flat Bands, Indirect Gaps, and Unconventional Spin-Wave Behavior Induced by a Periodic Dzyaloshinskii-Moriya Interaction
R. A. Gallardo, D. Cortés-Ortuno, T. Schneider, A. Roldán-Molina, F. Ma, K. Lenz, H. Fangohr, J. Lindner, P. Landeros
Phys. Rev. Lett. 122, 067204 (2019)

Spin-Wave Modes in Transition from a Thin Film to a Full Magnonic Crystal
M. Langer, R. A. Gallardo, T. Schneider, S. Stienen, A. Roldán-Molina, Y. Yuan, K. Lenz, J. Lindner, P. Landeros, J. Fassbender
Phys. Rev. B 99, 024426 (2019)

Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance
H. Cansever, R. Narkowicz, K. Lenz, C. Fowley, L. Ramasubramanian, O. Yildirim, A. Niesen, T. Huebner, G. Reiss, J. Lindner, J. Fassbender, A. M. Deac
J. Phys. D Appl. Phys. 51, 224009 (2018)

Thick Permalloy films for the imaging of spin texture dynamics in perpendicularly magnetized systems
S. Finizio, S. Wintz, D. Bracher, E. Kirk, A. S. Semisalova, J. Förster, K. Zeissler, T. Weßels, M. Weigand, K. Lenz, A. Kleibert, J. Raabe
Phys. Rev. B 98, 104415 (2018)

Symmetries and localization properties of defect modes in metamaterial magnonic superlattices
R. A. Gallardo, T. Schneider, A. Roldán-Molina, M. Langer, A. S. Núñez, K. Lenz, J. Lindner, P. Landeros
Phys. Rev. B 97, 174404 (2018)

Dipolar interaction induced band gaps and flat modes in surface-modulated magnonic crystals
R. A. Gallardo, T. Schneider, A. Roldan-Molina, M. Langer, J. Fassbender, K. Lenz, J. Lindner, P. Landeros
Phys. Rev. B 97,144405 (2018)

Interplay between magnetic domain patterning and anisotropic magnetoresistance probed by magnetooptics
J. Osten, K. Lenz, H. Schultheiss, J. Lindner, J. McCord, J. Fassbender
Phys. Rev. B 97, 014415 (2018)

Ultra-dense planar metallic nanowire arrays with extremely large anisotropic optical and magnetic properties
Q. Jia, X. Ou, M. Langer, B. Schreiber, J. Grenzer, P. F. Siles, R. D. Rodriguez, K. Huang, Y. Yuan, A. Heidarian, R. Hübner, T. You, W. Yu, K. Lenz, J. Lindner, X. Wang, S. Facsko
Nano Research (2018)

Spin caloritronic nano-oscillator
C. Safranski, I. Barsukov, H. K. Lee, T. Schneider, A. A. Jara, A. Smith, H. Chang, K. Lenz, J. Lindner, Y. Tserkovnyak, M. Wu, I. N. Krivorotov
Nature Comms. 8, 117 (2017)

Role of the internal demagnetizing field for the dynamics of a surface-modulated magnonic crystal
M. Langer, F. Röder, R. A. Gallardo, T. Schneider, S. Stienen, C. Gatel, R. Hübner, L. Bischoff, K. Lenz, J. Lindner, P. Landeros, J. Fassbender
Phys. Rev. B 95, 184405 (2017)

Out-of-plane magnetized cone-shaped magnetic nanoshells
D. K. Ball, S. Günther, M. Fritzsche, K. Lenz, G. Varvaro, S. Laureti, D. Makarov, A. Mücklich, S. Facsko, M. Albrecht, J. Fassbender
J. Phys. D.: Appl. Phys. 50, 115004 (2017)

Programmability of Co-antidot lattices of optimized geometry
T. Schneider, M. Langer, J. Alekhina, E. Kowalska, A. oelschlägel, A. Semisalova, A. Neudert, K. Lenz, K. Potzger, M. P. Kostylev, J. Fassbender, A. O. Adeyeye, J. Lindner, R. Bali
Sci. Rep. 7, 41157 (2017)

Parameter-free determination of the exchange constant in thin films using magnonic patterning
M. Langer, K. Wagner, T. Sebastian, R. Hübner, J. Grenzer, Y. Wang, T. Kubota, T. Schneider, S. Stienen, J. Linder, K. Lenz, J. Linder, K. Takanashi, R. Arias, J. Fassender
Appl. Phys. Lett. 108, 102402 (2016)

Tailoring dynamic magnetic characteristics of Fe60Al40 films through ion irradiation
N. Tahir, R. Bali, R. Gieniusz, S. Mamica, J. Gollwitzer, T. Schneider, K. Lenz, K. Potzger, J. Lindner, M. Krawczyk, J. Fassbender, A. Maziewski
Phys. Rev. B 92, 144429 (2015)

Reduction of phase noise in nanowire spin orbit torque oscillators
L. Yang, R. Verba, V. Tiberkevich, T. Schneider, A. Smith, Z. Duan, B. Youngblood, K. Lenz, J. Lindner, A. N. Slavin, I. N. Krivorotov
Scientific Reports 5, 16942 (2015)

Direct measurement of the magnetic anisotropy field in Mn-Ga and Mn-Co-Ga Heusler films
C. Fowley, S. Ouardi, T. Kubota, Y. Oguz, A. Neudert, K. Lenz, V. Sluka, J. Lindner, J. M. Law, S. Mizukami, G. H. Fecher, C. Felser, A. M. Deac
J. Phys. D: Appl. Phys. 48, 164006 (2015)

Frequency-Domain Magnetic Resonance—Alternative Detection Schemes for Samples at the Nanoscale
M. Möller, K. Lenz, J. Lindner
J. Surf. Interf. Mater. 2, 46 (2014)

Simultaneous measurement of anisotropic magnetoresistance and observation of magnetic domains by Kerr microscopy
J. Osten, K. Lenz, A. Henschke, J. Lindner, J. Fassbender
Rev. Sci. Instr. 85, 123701 (2014)

Tuning perpendicular anisotropy gradient in Co/Pd multilayers by ion irradiation
Peter K. Greene, J. Osten, K. Lenz, J. Fassbender, C. Jenkins, E. Arenholz, T. Endo, N. Iwata, K. Liu
Appl. Phys. Lett. 105, 072401 (2014)

Role of preparation and implantation-related defects for the magnetic properties of Zn0.9Co0.1O epitaxial films
V. Ney, K. Lenz, K. Ollefs, F. Wilhelm, A. Rogalev, A. Ney
J. Appl. Phys. 116, 043912 (2014)

Magnetic properties of granular CoCrPt:SiO2 thin films deposited on GaSb nanocones
D. K. Ball, K. Lenz, M. Fritzsche, G. Varvaro, S. Günther, P. Krone, D. Makarov, A. Mücklich, S. Facsko, J. Fassbender, M. Albrecht
Nanotechnology 25, 085703 (2014)

Quantitative imaging of the magnetic configuration of modulated nanostructures by electron holography
M. Körner, F. Röder, K. Lenz, M. Fritzsche, J. Lindner, H. Lichte, J. Fassbender
Small 10, 5161 (2014)

Magneto-optical analysis of stripe elements embedded in a synthetic antiferromagnet
M. Langer, A. Neudert, J. I. Mönch, R. Mattheis, K. Lenz, J. Fassbender, and J. McCord
Phys. Rev. B 89, 064411 (2014)

Splitting of spin-wave modes in thin films with arrays of periodic perturbations: theory and experiment
R. A. Gallardo, K. Lenz, A. Banholzer, M. Körner, J. Lindner, J. Fassbender, and P. Landeros
New. J. Phys. 16, 023015 (2014)

Magnetic properties of granular CoCrPt:SiO2 thin films deposited on GaSb nanocones
D. K. Ball, K. Lenz, M. Fritzsche, G. Varvaro, S. Günther, P. Krone, D. Makarov, A. Mücklich, S. Facsko, J. Fassbender, and M. Albrecht
Nanotechnology 25, 085703 (2014)


Finished Projects


Former Members and Guests:

Dr. Anna Semisalova (Postdoc, 2017-2019)

Tobias Schneider (Doktorand, 2016-2018)

Ronny Thomas (Master, 2018)

Dr. Denise Erb (Postdoc, 2015-2017)

Dr. Julia Osten (Postdoc,2017-2018)

Manuel Langer (Doktorand, 2013-2017)

    Dr. Elisabeth Josten (Postdoc)

    Julia Osten (Doktorand, 2011-2015)

    Anja Banholzer (Doktorand, 2012-2015)

    Clemens Grubritz (Praktikant, 2014)

    Sven Hoffmann (Bachelor, 2014)

    Hande, Isim (Summer student, 2014)

    Simon Rupp (Bachelor, 2014)

    Moritz Brütting (Praktikant, 2013)

    Nataliya Svechkina (Summer student, 2013)  

    Andreas Jansen (Praktikant, 2012, 2013)

    Andreas Neudert (Postdoc, 2010-2013)

    Michael Körner (Doktorand, 2009-2013)

    David Ball (PhD, 2009-2012)

    Mario Trache (Diploma, 2012)

    Jakob Gollwitzer (RISE-scholar, 2012, summer student 2013)

    Alexandru Trifu (summer student, 2012)

    Carsten Peukert (student, 2012)

    Tobias Schneider (undergraduate student, 2011)

    Markus Koch (undergraduate student, 2011)

    Heiko Noack (Diploma, 2011)

    Daniel Markó (PhD, 2006-2010)

    Dr. Resul Yilgin (Guest, 2009-2010)


Contact

Dr. Kilian Lenz

Research Group Head
Magnetization Dynamics
k.lenzAthzdr.de
Phone: +49 351 260 2435