Jan Caron

Forschungszentrum Jülich

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Forschungszentrum Jülich

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Jan Caron has a total of 52 co-authors. Here are the top co-authors by number of shared publications:

András Kovács
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Julich, Jülich, GERMANY
4 shared publications
Rafal E. Dunin-Borkowski
Forschungszentrum Jülich GmbH
4 shared publications
Dongsheng Song
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany
2 shared publications
Qianqian Lan
Ernst Ruska‐Centre for Microscopy and Spectroscopy With Electrons Forschungszentrum Jülich Germany
2 shared publications
Rafal E. Dunin-Borkowski
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
2 shared publications
Abijith Bahuleyan
1 shared publication

Latest Publications

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Cited by 10
- 25 September 2024
- Published by Mineralogical Society in Geo-Bio Interfaces
Influence of crystal shape and orientation on the magnetic microstructure of bullet-shaped magnetosomes synthesized by magnetotactic bacteria
by András Kovács, Mihály Pósfai, Benjamin Zingsem, Zi-An Li, Péter Pekker, Jan Caron, Sandra Prévéral, Christopher T. Lefèvre, Dennis A. Bazylinski, Richard B. Frankel, et al.
Cells of magnetotactic bacteria are used as model systems for studying the magnetic properties of ferrimagnetic nanocrystals. Each individual bacterial strain produces magnetosomes (membrane-bounded magnetic crystals) that have distinct sizes, shapes, crystallographic orientations and spatial arrangements, thereby providing nanoparticle systems whose unique magnetic properties are unmatched by synthetic chemically-produced crystals. Here, we use off-axis electron holography in the transmission electron microscope to study the magnetic properties of isolated and closely-spaced bullet-shaped magnetite (Fe₃O₄) magnetosomes biomineralized by the following magnetotactic bacterial strains: the cultured Desulfovibrio magneticus RS-1 and the uncultured strains LO-1 and HSMV-1. These bacteria biomineralize magnetite crystals whose crystallographic axes of elongation are parallel to (RS-1 and LO-1) or (HSMV-1). We show that the individual magnetosome crystals are single magnetic domains and measure their projected in-plane magnetization distributions and magnetic dipole moments. We use analytical modelling to assess the interplay between shape anisotropy and the magnetically preferred magneto-crystalline easy axis of magnetite.
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- 25 September 2024
- Published by Mineralogical Society in Geo-Bio Interfaces
Open Access
Influence of crystal shape and orientation on the magnetic microstructure of bullet-shaped magnetosomes synthesized by magnetotactic bacteria
by András Kovács, Mihály Pósfai, Benjamin Zingsem, Zi-An Li, Péter Pekker, Jan Caron, Sandra Prévéral, Christopher T. Lefèvre, Dennis A. Bazylinski, Richard B. Frankel, et al.
Cells of magnetotactic bacteria are used as model systems for studying the magnetic properties of ferrimagnetic nanocrystals. Each individual bacterial strain produces magnetosomes (membrane-bounded magnetic crystals) that have distinct sizes, shapes, crystallographic orientations and spatial arrangements, thereby providing nanoparticle systems whose unique magnetic properties are unmatched by synthetic chemically-produced crystals. Here, we use off-axis electron holography in the transmission electron microscope to study the magnetic properties of isolated and closely-spaced bullet-shaped magnetite (Fe₃O₄) magnetosomes biomineralized by the following magnetotactic bacterial strains: the cultured Desulfovibrio magneticus RS-1 and the uncultured strains LO-1 and HSMV-1. These bacteria biomineralize magnetite crystals whose crystallographic axes of elongation are parallel to (RS-1 and LO-1) or (HSMV-1). We show that the individual magnetosome crystals are single magnetic domains and measure their projected in-plane magnetization distributions and magnetic dipole moments. We use analytical modelling to assess the interplay between shape anisotropy and the magnetically preferred magneto-crystalline easy axis of magnetite.
Cited by 10
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Cited by 6
- 28 July 2022
- Published by American Physical Society (APS) in Physical Review Letters
Electrostatic Shaping of Magnetic Transition Regions in ${La}_{0.7} {Sr}_{0.3} {MnO}_{3}$
by Qianqian Lan, Chuanshou Wang, Lei Jin, Michael Schnedler, Lars Freter, Kurt Fischer, Jan Caron, Xian-Kui Wei, Thibaud Denneulin, András Kovács, et al.
We report a magnetic transition region in ${La}_{0.7} {Sr}_{0.3} {MnO}_{3}$ with gradually changing magnitude of magnetization, but no rotation, stable at all temperatures below $T_{C}$ . Spatially resolved magnetization, composition and Mn valence data reveal that the magnetic transition region is induced by a subtle Mn composition change, leading to charge transfer at the interface due to carrier diffusion and drift. The electrostatic shaping of the magnetic transition region is mediated by the Mn valence, which affects both magnetization by ${Mn}^{3 +} − {Mn}^{4 +}$ double exchange interaction and free carrier concentration.
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- 28 July 2022
- Published by American Physical Society (APS) in Physical Review Letters
Electrostatic Shaping of Magnetic Transition Regions in ${La}_{0.7} {Sr}_{0.3} {MnO}_{3}$
by Qianqian Lan, Chuanshou Wang, Lei Jin, Michael Schnedler, Lars Freter, Kurt Fischer, Jan Caron, Xian-Kui Wei, Thibaud Denneulin, András Kovács, et al.
We report a magnetic transition region in ${La}_{0.7} {Sr}_{0.3} {MnO}_{3}$ with gradually changing magnitude of magnetization, but no rotation, stable at all temperatures below $T_{C}$ . Spatially resolved magnetization, composition and Mn valence data reveal that the magnetic transition region is induced by a subtle Mn composition change, leading to charge transfer at the interface due to carrier diffusion and drift. The electrostatic shaping of the magnetic transition region is mediated by the Mn valence, which affects both magnetization by ${Mn}^{3 +} − {Mn}^{4 +}$ double exchange interaction and free carrier concentration.
Cited by 6
Open Access
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Cited by 31
- 11 March 2022
- Published by Elsevier in iScience
Highly complex magnetic behavior resulting from hierarchical phase separation in AlCo(Cr)FeNi high-entropy alloys
by Qianqian Lan, András Kovács, Jan Caron, Hongchu Du, Dongsheng Song, Sriswaroop Dasari, Bharat Gwalani, Varun Chaudhary, Raju V. Ramanujan, Rajarshi Banerjee, et al.
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- 11 March 2022
- Published by Elsevier in iScience
Open Access
Highly complex magnetic behavior resulting from hierarchical phase separation in AlCo(Cr)FeNi high-entropy alloys
by Qianqian Lan, András Kovács, Jan Caron, Hongchu Du, Dongsheng Song, Sriswaroop Dasari, Bharat Gwalani, Varun Chaudhary, Raju V. Ramanujan, Rajarshi Banerjee, et al.
Cited by 31
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Cited by 6
- 1 February 2022
- Published by Elsevier in Journal of Magnetism and Magnetic Materials
Quantitative imaging of the magnetic field distribution in an artificial spin ice studied by off-axis electron holography
by Teresa Weßels, András Kovács, Sebastian Gliga, Simone Finizio, Jan Caron, Rafal E. Dunin-Borkowski
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- 1 February 2022
- Published by Elsevier in Journal of Magnetism and Magnetic Materials
Open Access
Quantitative imaging of the magnetic field distribution in an artificial spin ice studied by off-axis electron holography
by Teresa Weßels, András Kovács, Sebastian Gliga, Simone Finizio, Jan Caron, Rafal E. Dunin-Borkowski
Cited by 6
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Cited by 14
- 31 August 2020
- Published by American Physical Society (APS) in Physical Review B
Robust nature of the chiral spin helix in $Cr {Nb}_{3} S_{6}$ nanostructures studied by off-axis electron holography
by Dongsheng Song, Lin Wang, Weiwei Wang, Fengshan Zheng, Jin Tang, Shasha Wang, Chao Zhu, Jan Caron, András Kovács, Zheng Liu, et al.
Magnetic soliton crystals with layered structures that host periodic chiral helimagnetic ordering are promising candidates for spintronic nanodevices. Among them, helimagnetic $Cr {Nb}_{3} S_{6}$ is unique owing to its crystallographic chirality and monoaxial Dzyaloshinskii-Moriya interaction. It is crucial to explore its magnetic configurations and properties with respect to the temperature and thickness, especially in reduced dimensions. Here, the chiral helimagnetic ground state in $Cr {Nb}_{3} S_{6}$ nanostructures is investigated using off-axis electron holography in the transmission electron microscope. The period of the helical state is found to be independent of both temperature and specimen thickness, while the temperature dependence of the saturation magnetization is shown to follow a classical Heisenberg spin model. Monte Carlo simulations based on a discrete classical Heisenberg model reproduce the experimental observations closely, confirming the applicability of a three-dimensional Heisenberg model even in a confined specimen geometry.
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- 31 August 2020
- Published by American Physical Society (APS) in Physical Review B
Open Access
Robust nature of the chiral spin helix in $Cr {Nb}_{3} S_{6}$ nanostructures studied by off-axis electron holography
by Dongsheng Song, Lin Wang, Weiwei Wang, Fengshan Zheng, Jin Tang, Shasha Wang, Chao Zhu, Jan Caron, András Kovács, Zheng Liu, et al.
Magnetic soliton crystals with layered structures that host periodic chiral helimagnetic ordering are promising candidates for spintronic nanodevices. Among them, helimagnetic $Cr {Nb}_{3} S_{6}$ is unique owing to its crystallographic chirality and monoaxial Dzyaloshinskii-Moriya interaction. It is crucial to explore its magnetic configurations and properties with respect to the temperature and thickness, especially in reduced dimensions. Here, the chiral helimagnetic ground state in $Cr {Nb}_{3} S_{6}$ nanostructures is investigated using off-axis electron holography in the transmission electron microscope. The period of the helical state is found to be independent of both temperature and specimen thickness, while the temperature dependence of the saturation magnetization is shown to follow a classical Heisenberg spin model. Monte Carlo simulations based on a discrete classical Heisenberg model reproduce the experimental observations closely, confirming the applicability of a three-dimensional Heisenberg model even in a confined specimen geometry.
Cited by 14
Open Access
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Cited by 61
- 20 June 2020
- Published by The Open Journal in Journal of Open Source Software
LiberTEM: Software platform for scalable multidimensional data processing in transmission electron microscopy
by Alexander Clausen, Dieter Weber, Karina Ruzaeva, Vadim Migunov, Anand Baburajan, Abijith Bahuleyan, Jan Caron, Rahul Chandra, Sayandip Halder, Magnus Nord, et al.
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- 20 June 2020
- Published by The Open Journal in Journal of Open Source Software
Open Access
LiberTEM: Software platform for scalable multidimensional data processing in transmission electron microscopy
by Alexander Clausen, Dieter Weber, Karina Ruzaeva, Vadim Migunov, Anand Baburajan, Abijith Bahuleyan, Jan Caron, Rahul Chandra, Sayandip Halder, Magnus Nord, et al.
Cited by 61