Abstract
We have investigated the structural and magnetic properties of \(\hbox {Ge}_{0.94}\hbox {Mn}_{0.06-\delta }\hbox {C}_{\delta }\) films \((\delta = 0.005, 0.01\ \hbox {and} 0.02)\) using reflexion high-energy electron diffraction (RHEED) technique, transmission electron microscopy (TEM) and superconducting quantum interference device magnetometer. All films have been prepared by co-depositing Ge, Mn and C by molecular beam epitaxy. RHEED pattern shows the increase in sample surface roughness when doping carbon into the GeMn films. TEM analyses indicate that adding carbon greatly reduces the surface diffusion of both Ge and Mn elements. Ferromagnetic ordering in samples containing carbon contents of 0.01 and 0.02, persists at temperatures \({>}400\hbox { K}\). An increase in net magnetization is found for carbon-doped samples with increasing carbon content from 0.01 to 0.02. However, we found a decrease in the net magnetization and the Curie temperature of the samples after annealing at 450 and 650°C. The Curie temperature reduces down to about 300 K, which is comparable to the value of the free-carbon sample showing a harmful effect of the post-annealing on the magnetic properties of carbon-doped GeMn nanocolumns.
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Jamet M, Barski A, Devillers T, Poydenot V, Dujardin R, Bayle-Guillemaud P et al 2006 Nat. Mater.5 653
Li A P, Zeng C, Van Benthem K, Chisholm M F, Shen J, Rao S V S N et al 2007 Phys. Rev. B75 R201201
Zeng C, Zhang Z, van Benthem K, Chisholm M F and Weitering H H 2008 Phys. Rev. Lett.100 066101
Padova P D, Ayoub J P, Berbezier I, Perfetti P, Quaresima C, Testa A M et al 2008 Phys. Rev. B77 045203
Jaeger C, Bihler C, Vallaitis T, Goennenwein S T B, Opel M, Gross R et al 2006 Phys. Rev. B74 045330
Van der Meulen M I, Petkov N, Morris M A, Kazakova O, Han X, Wang K L et al 2009 Nano Lett.9 50
Devillers T, Jamet M, Barski A, Poydenot V, Bayle-Guillemaud P, Bellet-Amalric E et al 2007 Phys. Rev. B76 205306
Le T G and Dau M T 2016 Mod. Phys. Lett. B30 1650269
Le T G 2015 Mater. Sci. Appl.6 533
Spiesser A, Slipukhina I, Dau M T, Arras E, Le Thanh V, Michez L et al 2011 Phys. Rev. B84 165203
Spiesser A, Le Thanh V, Bertaina S and Michez L A 2011 Appl. Phys. Lett. 99 121904
Slipukhina I, Arras E, Mavropoulos Ph and Pochet P 2009 Appl. Phys. Lett. 94 192505
Dau M T, Le Thanh V, Le T G, Spiesser A, Petit M, Michez L A et al 2011 Appl. Phys. Lett. 99 151908
Michez L A, Spiesser A, Petit M, Bertaina S, Jacquot J F, Dufeu D et al 2015 J. Phys. Condens. Matter27 266001
Le T G, Dau M T, Le Thanh V, Nam D N H, Petit M, Michez L A et al 2012 Adv. Nat. Sci.: Nanosci. Nanotechnol.3 025007
Le T G, Nam D N H, Dau M T, Luong T K P, Khiem N V et al 2011 J. Phys.: Conf. Ser. 292 012012
Le T G and Nguyen Manh 2014 J. Sci. Technol. 52 30
Petit M, Michez L, Dutoit C E, Bertaina S, Dolocan V, Heresanu V et al 2015 Thin Solid Films589 427
Dau M T, Le Thanh V, Le T G, Spiesser A, Petit M, Michez L et al 2012 New J. Phys. 14 103020
Dau M T, Spiesser A, Le T G, Michez L, Olive Mendez S F, Le Thanh V et al 2010 Thin Solid Films518 S266
Leifeld O 1998 MRS Online Proceeding Library Archive533 183
Acknowledgements
We thank colleagues at Interdisciplinary Center of Nanoscience of Marseille (CINaM-CNRS), Aix-Marseille University, France, for their technical help and fruitful discussions.
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Le, T.G., Thanh, V. & Michez, L. Effect of carbon on structural and magnetic properties of \(\hbox {Ge}_{1-x}\hbox {Mn}_{x}\) nanocolumns. Bull Mater Sci 43, 103 (2020). https://doi.org/10.1007/s12034-020-2082-z
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DOI: https://doi.org/10.1007/s12034-020-2082-z