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Origin of room temperature ferromagnetism in MgO films
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TLDR
In this article, a systematic study of the crystallinity dependence of room-temperature ferromagnetism in pure MgO thin films prepared by pulsed laser deposition is presented.Abstract:
We report a systematic study of the crystallinity dependence of room-temperature ferromagnetism (RTFM) in pure MgO thin films prepared by pulsed laser deposition. A sequential transition from ferromagnetism to diamagnetism as a function of deposition temperature is observed. All the samples deposited from room temperature (RT) to 200 °C show clear RTFM, and the magnetization decreases monotonically with the increase of the substrate temperature, whereas the MgO film grown at 300 °C shows diamagnetism behavior like bulk MgO sample. The maximum saturation magnetization of 8 emu/cm3 is obtained for the MgO film deposited at RT, which degrades dramatically after crystallization under the annealing in both vacuum and air atmosphere. Further photoluminescence and X-ray photoelectron spectroscopies reveal that the ferromagnetism in the MgO thin films is correlated directly with the Mg vacancies.read more
Citations
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Magnetic and ferroelectric properties of Ni doped BaTiO3
TL;DR: In this article, structural, magnetic and ferroelectric properties of Ni doped barium titanate were investigated using solid state sintering technique and it was revealed from structural studies that the phase transformation from tetragonal to hexagonal phase is strongly influenced by Ni doping concentration.
Journal ArticleDOI
d° Ferromagnetism of Magnesium Oxide
Jitendra Pal Singh,Keun Hwa Chae +1 more
TL;DR: In this article, the origins of magnetism in magnesium oxide are discussed to obtain understanding of d° ferromagnetism, and the presence of vacancies at the surface and subsurface also affects the magnetic behavior of these oxides.
Journal ArticleDOI
Oxygen vacancy enhanced room temperature ferromagnetism in Al-doped MgO nanoparticles
TL;DR: In this paper, the authors investigated the room temperature ferromagnetic order that develops in Al-substituted magnesium oxide, Mg(Al)O, nanoparticles with Al fractions of up to 5 at.%.
Journal ArticleDOI
MgO nanosheets with N-doped carbon coating for the efficient visible-light photocatalysis
TL;DR: MgO nanosheets with N-doped carbon coating were fabricated for the enhanced photocatalytic degradation of dyes (methylene blue, methyl violet, and Rhodamine B) and antibiotics (ciprofloxacin and tetracycline hydrochloride).
Journal ArticleDOI
Oxygen vacancy enhanced room temperature magnetism in Al-doped MgO nanoparticles
TL;DR: In this paper, the room temperature magnetization in Al-substituted magnesium oxide, Mg(Al)O nanoparticles with Al fractions of up to 5 at. % was measured and the oxygen vacancies were largely responsible for the weak room temperature ferromagnetism in MgO.
References
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Journal ArticleDOI
Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriers
Stuart S. P. Parkin,Christian Kaiser,Alex Panchula,Philip M. Rice,Brian M. Hughes,Mahesh G. Samant,See-Hun Yang +6 more
TL;DR: Sputter-deposited polycrystalline MTJs grown on an amorphous underlayer, but with highly oriented MgO tunnel barriers and CoFe electrodes, exhibit TMR values of up to ∼220% at room temperature and ∼300% at low temperatures, which will accelerate the development of new families of spintronic devices.
Journal ArticleDOI
Thin films: unexpected magnetism in a dielectric oxide.
TL;DR: It is shown that thin films of hafnium dioxide (HfO2), an insulating oxide better known as a dielectric layer for nanoscale electronic devices, can be ferromagnetic even without doping.
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Room-temperature ferromagnetism observed in undoped semiconducting and insulating oxide thin films
TL;DR: In this article, the magnetic moment was observed in undoped semiconducting or insulating oxides to become ferromagnetic at room temperature on MgO substrates, where the magnetic field was applied parallel to the film plane.
Journal ArticleDOI
Ferromagnetism observed in pristine Sn O 2 thin films
TL;DR: In this article, room temperature ferromagnetism was observed in laser ablated undoped thin films grown on O(n) substrates (the saturated magnetization is about $12.3mantom{\rule{0.3em}{0ex}}\mathrm{emu}∕{cm}}^{3} ).
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Room-temperature ferromagnetism in MgO nanocrystalline powders
TL;DR: In this article, the observed room-temperature ferromagnetism in MgO nanocrystalline powders possibly originates from Mg vacancies at/near the surfaces of nanograins.