The relationship between magnetism and magneto-optical effects in rare earth doped aluminophosphate glasses

Văleanu, M.; Sofronie, M.; Gâlcă, A.C.; Ţolea, Felicia; Elisa, M.; Sava, Bogdan Alexandru; Boroica, Lucica; Kuncser, V.

doi:10.1088/0022-3727/49/7/075001

Cited by 29 publications

(12 citation statements)

References 28 publications

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“…The Faraday angle (rotation of the polarization plane under an applied field of induction B) was calculated using Equation (8) [ 9 ]:

where,

is the ellipsometric angle measured with the applied magnetic field (+0.2 T) and

is the ellipsometric angle without an applied magnetic field. Faraday ellipticity would be the difference between ellipsometric parameters Δ (the phase difference), recorded with and without the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…It is worth mentioning the previous results of the authors related to magnetic and magneto-optical properties of Dy 3+ /Tb 3+ /La 3+ alumina-phosphate vitreous systems applied as bulk Faraday rotators [ 9 , 10 , 11 ] as well as to the rare-earth-doped silico-phosphate sol–gel thin films for magneto-optical applications [ 12 ]. A very recent work of the authors also referred to thermal, structural, mechanical, magnetic and magneto-optical properties of Bi 2 O 3 and PbO-doped boron-phosphate glasses [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

et al. 2020

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This work investigates the structural, magnetic and magneto-optical properties of a new zinc phosphate-tellurite glass belonging to the 45ZnO-10Al2O3-40P2O5-5TeO2 system. The glass was prepared by a wet method of processing the starting reagents followed by suitable melting–stirring–quenching–annealing steps. Specific parameters such as density, average molecular mass, molar volume, oxygen packaging density, refractive index, molar refractivity, electronic polarizability, reflection loss, optical transmission, band gap and optical basicity have been reported together with thermal, magnetic and magneto-optical characteristics. Absorption bands appear in the blue and red visible region, while over 600 nm the glass becomes more transparent. FTIR and Raman spectra evidenced phosphate-tellurite vibration modes proving the P2O5 and TeO2 network forming role. Magnetic measurements reveal the diamagnetic character of the Te-doped glass with an additional weak ferromagnetic signal, specific to diluted ferromagnetic oxides. Positive Faraday rotation angle with monotonous decreasing value at increasing wavelength was evidenced from magneto-optical measurements. The final product is a composite material comprising of a non-crystalline vitreous phase and Te-based nanoclusters accompanied by oxygen vacancies. The metallic-like Te colloids are responsible for the dark reddish color of the glass whereas the accompanying oxygen vacancies might be responsible for the weak ferromagnetic signal persisting up to room temperature.

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“…The Faraday angle (rotation of the polarization plane under an applied field of induction B) was calculated using Equation (8) [ 9 ]:

where,

is the ellipsometric angle measured with the applied magnetic field (+0.2 T) and

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

et al. 2020

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“…The Faraday angle (rotation of the polarization plane under an applied field of induction B (Figure 6A) was calculated using the Equation : 46

θ_{normalF} = (ψ_{B +} - ψ_{B = 0}),

where

ψ_{normalB +}

is the ellipsometric angle measured with the applied magnetic field (+0.2 T) and

ψ_{normalB = 0}

is the ellipsometric angle without an applied magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…Verdet constant is calculated using Equation : 46,47

θ_{normalF} = V B d,

where θ F is directly proportional with the applied magnetic field, B , the geometrical path of the light through the glass (eg, the glass thickness), d, and a proportional constant, V , named Verdet constant that is a specific for each material. Verdet constant in dependence on visible wavelength is presented in Figure 6B.…”

Section: Resultsmentioning

confidence: 99%

“…The obtained value of 7 × 10 −5 μ B/molecule is more than two order of magnitude lower than the magnetic moment of a paramagnetic center dispersed in a molecule showing that in fact the ferromagnetic component has to be negligible in respect to the magneto‐optic effects which will be discussed in the following. To note that the paramagnetic susceptibility is lower than the diamagnetic one even at low temperature (eg 10 K), showing that at room temperature the magneto‐optical rotational effect (proportional to the magnetic susceptibility 46 is due mainly to the diamagnetic component. Concerning the physical interpretation for a paramagnetic center, it is to note that expectedly that magnetic carriers can be considered as most probable the Te ions (or TeO 2 group) and taking into account the molar composition of the titanium phosphate‐tellurite glass, a magnetic moment of 0.24 μ B per TeO 2 group (or Te ion) can be estimated.…”

Section: Discussionmentioning

confidence: 99%

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Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

et al. 2020

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This work is focused on investigation of thermal, structural, optical, magnetic, and magneto‐optical properties of novel titanium phosphate‐tellurite glass applied as Faraday rotators. The glass belonging to the system 35Li2O–10Al2O3–5TiO2–45P2O5–5TeO2 was prepared by a nonconventional wet route of raw materials processing, followed by melting‐quenching‐annealing steps. Some important physical properties of the investigated glass have been measured and calculated, providing knowledge related to glass compactness, electronic structure, glass forming capability, etc. XRD analysis evidenced an amorphous network structure of the investigated glass. The optical absorption in the Vis domain is mainly due to Ti3+ ions and Te2 clusters formed during the glass melting process. A relatively low optical absorption is noticed over 600 nm that activates a significant Faraday magneto‐optical effect. Photoluminescence bands in the blue, red, and infrared domains are observed, caused by Te2 clusters formed during the glass melting process. The magnetization in dependency on applied magnetic field reveals a complex behavior of the glass, depending on temperature. Thus, it is found a ferromagnetic behavior up to 2000 Oe, a paramagnetic component up to 40 000 Oe, followed by a diamagnetic one over 40 000 Oe. Faraday rotation angle and Verdet constant values in the visible domain are correlated with the reduced TeO2 content of the glass.

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Mechanochemical Synthesis and Characterization of Nanostructured ErB₄ and NdB₄ Rare‐Earth Tetraborides

Boztemur,

Kaya,

Derin

et al. 2024

Adv Eng Mater

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Rare‐earth borides have become very popular in recent decades with high mechanical strength, melting point, good corrosion, wear, and magnetic behavior. However, the production of these borides is very challenging and unique. The production of ErB4 and NdB4 nanopowders via mechanochemical synthesis (MCS) is reported in this study first time in the literature. Er2O3 or Nd2O3, B2O3, and Mg initial powders are mechanically alloyed for different milling times to optimize the process. Rare‐earth borides with MgO phases are synthesized, then MgO is removed with HCl acid. The nanostructured rare‐earth tetraboride powders are analyzed using X‐ray diffraction (XRD). Based on the XRD, ErB4 powders are produced successfully at the end of the 5 h milling. However, the NdB4 phase does not occur as the stoichiometric ratio, so the B2O3 amount is decreased to nearly 35 wt%. When the amount of B2O3 is decreased to 20 wt%, NdB4 and NdB6 phases are 50:50 according to the Rietveld analysis. However, a homogenous NdB4 phase is obtained with 30 wt% loss of B2O3. The average particle sizes of ErB4 and NdB4 powders are nearly 100.4 and 85.6 nm, respectively. The rare‐earth tetraborides exhibit antiferromagnetic‐to‐paramagnetic‐like phase transitions at 18 and 8.53 K, respectively.

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The relationship between magnetism and magneto-optical effects in rare earth doped aluminophosphate glasses

Cited by 29 publications

References 28 publications

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

Mechanochemical Synthesis and Characterization of Nanostructured ErB₄ and NdB₄ Rare‐Earth Tetraborides

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The relationship between magnetism and magneto-optical effects in rare earth doped aluminophosphate glasses

Cited by 29 publications

References 28 publications

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

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Product

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Mechanochemical Synthesis and Characterization of Nanostructured ErB₄ and NdB₄ Rare‐Earth Tetraborides