N. von den Driesch
Forschungszentrum Jülich
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Publication
Featured researches published by N. von den Driesch.
Physical Review B | 2013
Frank Volmer; Marc Drögeler; Eva Maynicke; N. von den Driesch; M. L. Boschen; G. Güntherodt; Bernd Beschoten
We investigate spin and charge transport in both single and bilayer graphene non-local spin-valve devices. Similar to previous studies on bilayer graphene, we observe an inverse dependence of the spin lifetime on the carrier mobility in our single layer devices. This general trend is only observed in devices with large contact resistances. Furthermore, we observe a second Dirac peak in devices with long spin lifetimes. This results from charge transport underneath the contacts. In contrast, all devices with low ohmic contact resistances only exhibit a single Dirac peak. Additionally, the spin lifetime is significantly reduced indicating that an additional spin dephasing occurs underneath the electrodes.
Applied Physics Letters | 2015
C. Schulte-Braucks; Daniela Stange; N. von den Driesch; Sebastian Blaeser; Z. Ikonić; Jean-Michel Hartmann; S. Mantl; D. Buca
Certain GeSn alloys are group IV direct bandgap semiconductors with prospects for electrical and optoelectronical applications. In this letter, we report on the temperature dependence of the electrical characteristics of high Sn-content Ge0.89Sn0.11 p-i-n diodes. NiGeSn contacts were used to minimize the access resistance and ensure compatibility with silicon technology. The major emphasis is placed on the negative differential resistance in which peak to valley current ratios up to 2.3 were obtained. TCAD simulations were performed to identify the origin of the various current contributions, providing evidence for direct band to band tunneling and trap assisted tunneling.
Physical Review B | 2014
Frank Volmer; Marc Drögeler; Eva Maynicke; N. von den Driesch; M. L. Boschen; G. Güntherodt; Christoph Stampfer; Bernd Beschoten
By successive oxygen treatments of graphene nonlocal spin-valve devices we achieve a gradual increase of the contact-resistance\char21{}area products
ACS Applied Materials & Interfaces | 2016
C. Schulte-Braucks; N. von den Driesch; Stefan Glass; A. T. Tiedemann; U. Breuer; A. Besmehn; J.M. Hartmann; Zoran Ikonic; Qing-Tai Zhao; S. Mantl; D. Buca
({R}_{c}A)
international electron devices meeting | 2016
Rahul Pandey; C. Schulte-Braucks; Redwan N. Sajjad; Michael Barth; Ram Krishna Ghosh; Benjamin Grisafe; Pankaj Sharma; N. von den Driesch; Anurag Vohra; B. Rayner; Roger Loo; S. Mantl; D. Buca; Chih-Chieh Yeh; Cheng-Hsien Wu; Wilman Tsai; Dimitri A. Antoniadis; Suman Datta
of Co/MgO spin injection and detection electrodes and a transition from linear to nonlinear characteristics in the respective differential
ACS Applied Materials & Interfaces | 2017
C. Schulte-Braucks; Keyvan Narimani; Stefan Glass; N. von den Driesch; J.M. Hartmann; Z. Ikonić; V. V. Afanas’ev; Qing-Tai Zhao; S. Mantl; D. Buca
dV\text{\ensuremath{-}}dI
international electron devices meeting | 2017
Daniela Stange; N. von den Driesch; Denis Rainko; T. Zabel; Bahareh Marzban; Z. Ikonić; P. Zaumseil; G. Capellini; S. Manti; Jeremy Witzens; H. Sigg; Detlev Grützmacher; D. Buca
curves. With this manipulation of the contacts, both spin lifetime and the amplitude of the spin signal can significantly be increased by a factor of seven in the same device. This demonstrates that contact-induced spin dephasing is the bottleneck for spin transport in graphene devices with small
photonics society summer topical meeting series | 2015
D. Buca; Daniela Stange; C. Schulte-Braucks; Stephan Wirths; N. von den Driesch; S. Mantl; Detlev Grützmacher; R. Geiger; T. Zabel; H. Sigg; R. Marzaban; Jeremy Witzens; Z. Ikonić; J.M. Hartmann
{R}_{c}A
APL Materials | 2018
P. Zaumseil; Y. Hou; Markus Andreas Schubert; N. von den Driesch; Daniela Stange; Denis Rainko; M. Virgilio; D. Buca; G. Capellini
values. With increasing
joint international eurosoi workshop and international conference on ultimate integration on silicon | 2017
Keyvan Narimani; Stefan Glass; Torsten Rieger; P. Bernardy; N. von den Driesch; S. Mantl; Qing-Tai Zhao
{R}_{c}A