Search for ferromagnetism in SnO₂doped with transition metals (V, Mn, Fe, and Co)

Abstract

Based on first-principles calculations, we have investigated electronic structures and magnetic properties of SnO 2 doped with V, Mn, Fe, and Co. Our results show that ferromagnetism is the ground state and that the Curie temperatures are expected to have high values for Fe-and Co-doped SnO 2 , which is in good agreement with the experimental observations (Ogale et al 2003 Phys. Rev. Lett. 91 077205; Coey et al 2004 Appl. Phys. Lett. 84 1332). However, in V-and Mn-doped SnO 2 , paramagnetism is more stable than ferromagnetism. In addition, we also probe the effect of an oxygen vacancy. The results exhibit that an oxygen vacancy strongly influences the magnetic properties of these doped systems, and an oxygen vacancy strongly attracts Fe and Co ions. As a result, transition metal-oxygen vacancy-transition metal groups will be common in Fe-and Co-doped SnO 2 , but this tendency does not exist in the cases of V and Mn doping. In V-doped SnO 2 , ferromagnetism becomes more stable than antiferromagnetism after inducing additional n-type carriers and the Curie temperature increases with increasing density of n-type carriers. Hence, raising the density of n-type carriers is a practical way to realize high Curie temperatures in V-doped SnO 2 .

Ferromagnetism in Mechanically Milled Sn1−x Co x O2 (x=0 to 0.10) Compounds

“…This value is comparable to that reported by Ogale et al [5] for 5% Co-doped SnO 2 thin film. Such a high M si value can be explained in terms of unquenched d-orbital of the doped Co-ion and due to oxygen vacancy as explained in [40].…”

Ferromagnetism in SnO₂ by Mechanical Milling

“…The SnO 2 powder was milled by the planetary ball mill (Fritch Pulverisette-7, Germany) with WC vials. The inner diameter and volume of each vial were 40 mm and 45 cm 3 , respectively, and the WC balls with 15 mm diameter were used as the grinding media. About 2 g of SnO 2 powder was the starting material.…”

“…The ab initio calculations for the (TM) x Sn 1-x O 2 (TM= V, Mn, Fe and Co) were performed [1][2][3], and it was concluded that ferromagnetic moments appeared for Fe, Co, but not for V and Mn. In the study by our group [4], the TM oxides (V 2 O 5 , VO 2 Except for the TM-doped SnO 2 , the room temperature ferromagnetism, induced by the oxygen vacancies, has been reported for SnO 2 thin films, nano-particles and nano-wires [5][6][7][8].…”

Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior

“…Typically, they have Curie temperatures below 100 K making them unattractive for practical applications in future devices characterized by simultaneous control of spin and charge of electrons [1]. Recently, oxide (ZnO, TiO 2 , SnO 2 , In 2 O 3 )-based DMS materials have attracted considerable attention due to the reports of ferromagnetism at room temperature which open the possibility of their application in emerging field of thin-film magneto-optic and spin-electronic devices [2][3][4][5][6][7][8][9][10][11][12].…”