Magnetic and optical properties of virgin arc furnace grown MgO crystals

Prucnal, S.; Shalimov, A.; Ozerov, Mykhaylo; Potzger, К.; Skorupa, W.

doi:10.1016/j.jcrysgro.2011.11.067

Cited by 8 publications

(19 citation statements)

References 21 publications

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“…Extensive defect photoluminescence studies on different forms of MgO have been performed since the late 1960s. These include studies on single crystal [22], nanocrystalline [23] and thin film [23]. MgO synthesised by a multitude of methods.…”

Section: Introductionmentioning

confidence: 99%

“…Of importance to the research presented in this manuscript are much less studied defects, the vanadium (V 2+ ) and chromium (Cr 3+ ) ion substitutional defects. To the author’s knowledge only one research team has studied the near-infrared signal from a bulk MgO sample excited by 325 nm and 532 nm radiation [22]. This study assigns the 688 nm and 700 nm lines, only excited by 532 nm laser, and the broad 800 nm line to Cr 3+ substitutional defects.…”

Section: Introductionmentioning

confidence: 99%

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Biocompatible and Biodegradable Magnesium Oxide Nanoparticles with In Vitro Photostable Near-Infrared Emission: Short-Term Fluorescent Markers

et al. 2019

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Imaging of biological matter by using fluorescent nanoparticles (NPs) is becoming a widespread method for in vitro imaging. However, currently there is no fluorescent NP that satisfies all necessary criteria for short-term in vivo imaging: biocompatibility, biodegradability, photostability, suitable wavelengths of absorbance and fluorescence that differ from tissue auto-fluorescence, and near infrared (NIR) emission. In this paper, we report on the photoluminescent properties of magnesium oxide (MgO) NPs that meet all these criteria. The optical defects, attributed to vanadium and chromium ion substitutional defects, emitting in the NIR, are observed at room temperature in NPs of commercial and in-house ball-milled MgO nanoparticles, respectively. As such, the NPs have been successfully integrated into cultured cells and photostable bright in vitro emission from NPs was recorded and analyzed. We expect that numerous biotechnological and medical applications will emerge as this nanomaterial satisfies all criteria for short-term in vivo imaging.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biocompatible and Biodegradable Magnesium Oxide Nanoparticles with In Vitro Photostable Near-Infrared Emission: Short-Term Fluorescent Markers

et al. 2019

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“…It has also been pointed out that presence of nitrogen can influence magnetic property of MgO [ 17 , 18 ]. Although there are many theoretical and experimental studies regarding RTFM in MgO, there is still a lack of understanding about the origin of such phenomenon [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetism of Amorphous and Nano-Crystallized Dc-Sputter-Deposited MgO Thin Films

et al. 2013

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We report a systematic study of room-temperature ferromagnetism (RTFM) in pristine MgO thin films in their amorphous and nano-crystalline states. The as deposited dc-sputtered films of pristine MgO on Si substrates using a metallic Mg target in an O2 containing working gas atmosphere of (N2 + O2) are found to be X-ray amorphous. All these films obtained with oxygen partial pressure (PO2) ~10% to 80% while maintaining the same total pressure of the working gas are found to be ferromagnetic at room temperature. The room temperature saturation magnetization (MS) value of 2.68 emu/cm3 obtained for the MgO film deposited in PO2 of 10% increases to 9.62 emu/cm3 for film deposited at PO2 of 40%. However, the MS values decrease steadily for further increase of oxygen partial pressure during deposition. On thermal annealing at temperatures in the range 600 to 800 °C, the films become nanocrystalline and as the crystallite size grows with longer annealing times and higher temperature, MS decreases. Our study clearly points out that it is possible to tailor the magnetic properties of thin films of MgO. The room temperature ferromagnetism in MgO films is attributed to the presence of Mg cation vacancies.

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“…Recently, the influence of the transition metal impurities on the optical and magnetic properties of a bare MgO substrate was studied. 27 Since the low temperature magnetic hysteresis shows a clear paramagnetic behavior superimposed on it, we assume that the magnetization M imp of these impurities can be described by the Brillouin function …”

Section: Discussionmentioning

confidence: 99%

“…(1) to the low temperature magnetization of a bare MgO substrate, we estimate that in the MgO substrates in Figure 8(a), the concentration of the impurities is in the range of 15-60 ppm. 27 When the contribution of the impurities in the MgO substrate is subtracted using Eq. (1), the Sm-Co film yields a hysteresis loop as shown in Figure 9.…”

Section: Discussionmentioning

confidence: 99%

Magnetic properties of Sm-Co thin films grown on MgO(100) deposited from a single alloy target

Verhagen

Boltje

Ruitenbeek

et al. 2014

Journal of Applied Physics

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We have grown epitaxial Sm-Co thin films by sputter deposition from a single alloy target with a nominal SmCo 5 composition on Cr(100)-buffered MgO(100) single-crystal substrates. By varying the Ar gas pressure, we can change the composition of the film from a SmCo 5 -like to a Sm 2 Co 7 -like phase. The composition, crystal structure, morphology, and magnetic properties of these films have been determined using Rutherford Backscattering, X-ray diffraction, and magnetization measurements. We find that we can grow films with, at room temperature, coercive fields as high as 3.3 T, but with a remanent magnetization which is lower than can be expected from the texturing. This appears to be due to the Sm content of the films, which is higher than expected from the content of the target, even at the lowest possible sputtering pressures. Moreover, we find relatively large variations of film properties using targets of nominally the same composition. At low temperatures, the coercive fields increase, as expected for these hard magnets, but in the magnetization, we observe a strong background signal from the paramagnetic impurities in the MgO substrates.

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Magnetic and optical properties of virgin arc furnace grown MgO crystals

Cited by 8 publications

References 21 publications

Biocompatible and Biodegradable Magnesium Oxide Nanoparticles with In Vitro Photostable Near-Infrared Emission: Short-Term Fluorescent Markers

Biocompatible and Biodegradable Magnesium Oxide Nanoparticles with In Vitro Photostable Near-Infrared Emission: Short-Term Fluorescent Markers

Magnetism of Amorphous and Nano-Crystallized Dc-Sputter-Deposited MgO Thin Films

Magnetic properties of Sm-Co thin films grown on MgO(100) deposited from a single alloy target

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