Oxygen vacancy enhanced room temperature magnetism in Al-doped MgO nanoparticles

Mishra, Debabrata; Mandal, Balaji P.; Mukherjee, Rupam; Naik, R.; Lawes, G.; Nadgorny, B.

doi:10.1063/1.4804425

Cited by 55 publications

(27 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Doping With Non-magnetic Ionsmentioning

confidence: 83%

“…Apart from magnetism observed in MgO doped with magnetic elements, the effect was also observed in materials when doped with non-magnetic ions [47][48][49][50]. The appearance of RTFM in this material is reported when doped by nonmagnetic Zn [47] and Al [48].…”

Section: Doping With Non-magnetic Ionsmentioning

confidence: 89%

“…The appearance of RTFM in this material is reported when doped by nonmagnetic Zn [47] and Al [48]. This behavior is ascribed to cation (zinc) vacancies in the first case [47] and to oxygen vacancies in other cases [48]. RTFM in MgO single crystals, implanted with 70 keV O ions with respective doses of 2 × 10 16 and 2 × 10 17 ions/cm 2 is associated with presence of Mg vacancies, however, implantation of C or N instead of oxygen plays a more effective role in ferromagnetic performance than Mg vacancies [49].…”

Section: Doping With Non-magnetic Ionsmentioning

confidence: 99%

See 2 more Smart Citations

d° Ferromagnetism of Magnesium Oxide

Singh

Chae

2017

Condensed Matter

View full text Add to dashboard Cite

Magnetism without d-orbital electrons seems to be unrealistic; however, recent observations of magnetism in non-magnetic oxides, such as ZnO, HfO 2 , and MgO, have opened new avenues in the field of magnetism. Magnetism exhibited by these oxides is known as d • ferromagnetism, as these oxides either have completely filled or unfilled d-/f-orbitals. This magnetism is believed to occur due to polarization induced by p-orbitals. Magnetic polarization in these oxides arises due to vacancies, the excitation of trapped spin in the triplet state. The presence of vacancies at the surface and subsurface also affects the magnetic behavior of these oxides. In the present review, origins of magnetism in magnesium oxide are discussed to obtain understanding of d • ferromagnetism.

show abstract

Section: Doping With Non-magnetic Ionsmentioning

confidence: 83%

Section: Doping With Non-magnetic Ionsmentioning

confidence: 89%

Section: Doping With Non-magnetic Ionsmentioning

confidence: 99%

See 1 more Smart Citation

d° Ferromagnetism of Magnesium Oxide

Singh

Chae

2017

Condensed Matter

View full text Add to dashboard Cite

show abstract

“…Sundaresan et al, [7] found d 0 magnetism to be a universal feature of NP's of otherwise nonmagnetic oxides such as CeO 2 , Al 2 O 3 , ZnO, In 2 O 3 or SnO 2 . The correlation of the RTM with the presence of oxygen vacancy defectors was observed in several studies [10][11][12][13]. Xue et al, [14] however exclude the oxygen vacancies as being the origin of the ferromagnetism in their hydrogenated ZnO NP's due to the absence the V O component in the visible light component in the photoluminescence (PL) spectrum of their hydrogenated NP's (the visible portions of the PL spectrum are due to the defects in the NP's [15].…”

Section: Introductionmentioning

confidence: 89%

Ferromagnetic behavior due to Al3+ doping into ZnO nanorods

Yingsamphancharoen

Nakarungsee

Herng

et al. 2016

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

“…Recently, numerous theoretical and experimental works have proposed that Mg vacancies can induce room temperature ferromagnetism in MgO [18][19][20]. However, Mishra et al reported that oxygen vacancies are largely responsible for the RT ferromagnetism in MgO [21]. Although there is a consensus that the ferromagnetism is related with native defects, considerable controversy on the origin of the magnetism still exists.…”

Section: Introductionmentioning

confidence: 99%

The Electronic Structures and Magnetic Properties in Ti-doped MgO

Chen

Song

Yan

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. Using first-principles calculations based on density functional theory, we investigated systematically the electronic structures and magnetic properties of Ti monodoping and (Ti, Mg vacancy) codoping in MgO. The results indicate that a single Ti substitution of Mg prefers the ferromagnetic ground state and behaves a metallic character. In addition, it has been found that the two Ti dopants favor AFM coupling in the near configuration, whereas the FM state is more stable in the far configuration. Interestingly, the FM stability can be evidently intensified by introducing Mg vacancy. The magnetic moment mainly comes from the spin polarized Ti 3d and O 2p electrons which can be explained in terms of p-d hybridization mechanism and room temperature ferromagnetism can be expected. Furthermore, the doped Ti atoms in the MgO host have no clustering tendency. These results suggest that the Ti-doped MgO is a promising candidate material for room temperature spintronics applications. IntroductionDiluted magnetic semiconductors (DMSs) have attracted considerable attention because they hold the promise of using electron spin, in addition to its charge, in creating a new class of spintronic semiconductor devices that combine the function of information processing and storage [1] [7]. Much effort has been devoted to study the nature of ferromagnetism, aiming at designing ferromagnetic DMS materials with RT ferromagnetism. However, a number of studies indicate that the RT ferromagnetism may come from precipitation of magnetic clusters or from the secondary magnetic phases and no convincing evidence can verify that the observed ferromagnetism is intrinsic. These extrinsic magnetic behaviors are undesirable for practical application. Up to now, the origin of ferromagnetism in oxide DMSs is still unclear.Recently, a new class of oxide ferromagnets has arisen, bringing new challenges for the understanding of the underlying physics of long-range ferromagnetic ordering in oxide compounds [8][9][10][11][12][13][14][15][16][17]. In these systems, the ferromagnetic behavior is driven by native defects and therefore there are no complications arising from additional phases or clustering effects induced by the doping process, thus they are considered as promising spintronic materials. However, the origin of the magnetism remains to be clarified.MgO has recently attracted a great deal of attention as a promising material to understand the magnetic mechanism of oxide ferromagnets. If MgO is made ferromagnetic via dilute magnetic doping, it may also work as a spin filter or induce a large magnetic-field effect. Besides that, Mg is an

show abstract

Oxygen vacancy enhanced room temperature magnetism in Al-doped MgO nanoparticles

Cited by 55 publications

References 34 publications

d° Ferromagnetism of Magnesium Oxide

d° Ferromagnetism of Magnesium Oxide

Ferromagnetic behavior due to Al3+ doping into ZnO nanorods

The Electronic Structures and Magnetic Properties in Ti-doped MgO

Contact Info

Product

Resources

About