Contact

Dr. Shengqiang Zhou
Head Functional Materials
s.zhouAthzdr.de
Phone: +49 351 260 - 2484

Magnetic nanocrystals in Mn implanted Si and Ge

Key researcher: S. Zhou (s(dot)zhou(at)hzdr.de)


Crystalline MnSi1.7 and Mn5Ge3 nanomagnets are formed inside Si or Ge matrix using Mn ion implantation at elavated temperature. We investigated their structural and magnetic properties. A temperature-dependent memory effect and slow magnetic relaxation are observed below the superparamagnetic blocking temperature of nanomagnets. Our findings corroborate that the observed spin-glass-like features are caused by the size distribution of  nanomagnets, rather than by the inter-particle interaction.


 

Projects:

(1) DFG-RFBR joint project for initializing international cooperation: Magnetic and structural properties of Mn-rich SiMn layers


Selected Results:

Mn5Ge3

 

 

Left Figure: XRD 2θ-θ scans revealing the formation of Mn5Ge3nanomagnets. Beside the main peaks from Ge(004), the diffraction peaks of Mn5Ge3(111), (002), (310), (222) and (004) are clearly visible. Figure is from Nanoscale Res. Lett. 7, 528 (2012).


Publications:

(6) S. Nikolaev, A. Semisalova, V. Rylkov, V. Tugushev, A. Zenkevich, A. Vasiliev, E. Pashaev, K. Chernoglazov, Y. Chesnokov, I. Likhachev, N. Perov, Yu. Matveyev, O. Novodvorskii, E. Kulatov, A. Bugaev, Y. Wang, S. Zhou, Ferromagnetism of MnxSi1-x (x~0.5) films grown in the shadow geometry by pulsed laser deposition method, AIP Advances 6, 015020 (2016).

(5) High-temperature ferromagnetism of Si1−xMnx (x≈0.52−0.55) alloys

V.V. Rylkov, A.S. Bugaev, O.A. Novodvorskii, V.V. Tugusheva, E.T. Kulatov, A.V. Zenkevichd, A.S. Semisalova, S.N. Nikolaev, A.S. Vedeneev, A.V. Shorokhovae, D.V. Aver′yanov, K.Yu. Chernoglazov,E.A. Gan′shina, A.B. Granovsky, Y. Wang, V.Ya. Panchenko, S. Zhou, Journal of Magnetism and Magnetic Materials, 393, 30-43 (2015).

(4) Magnetic Mn5Ge3 nanocrystals embedded in crystalline Ge: a magnet/semiconductor hybrid synthesized by ion implantation

Shengqiang Zhou, Wenxu Zhang, A. Shalimov, Yutian Wang, Zhisuo Huang, D. Buerger, A. Mücklich, Wanli Zhang, H. Schmidt, M. Helm, Nanoscale Res. Lett. 7, 528 (2012).

(3)  Memory effect in Mn5Ge3 nanomagnets embedded inside the Mn-diluted Ge matrix

Shengqiang Zhou, Artem Shalimov , Kay Potzger , Nicole Jeutter , Carsten Baehtz , Manfred Helm , Jürgen Fassbender , Heidemarie Schmidt, Appl. Phys. Lett. 95, 192505  (2009)..

(2) MnSi1.7 nanoparticles embedded inside Si: Superparamagnetism with a collective behavior

Shengqiang Zhou, Shalimov A, Potzger K, Muechlich A, Helm M, Fassbender J, Schmidt H, Phys. Rev. B 80, 174422 (2009).

(1) Structural and magnetic properties of Mn implanted Si

Shengqiang Zhou, K. Potzger, Gufei Zhang, A. Mücklich, F. Eichhorn, N. Schell, R. Grötzschel, B. Schmidt, W. Skorupa, M. Helm, J. Fassbender and D. Geiger, Phys. Rev. B 75, 085203 (2007)

Citations: 90