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Lau, G. C.; Klimczuk, Tomasz; Ronning, F.; McQueen, Tyrel M.; Cava, R. J.

doi:10.1103/physrevb.80.214414

Cited by 24 publications

(16 citation statements)

References 23 publications

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“…MnO, CoO, FeO, and NiO [8,9]. TM containing glasses have been studied in detail for their magnetic properties [10][11][12][13][14][15]. On the other hand, their magneto-optical (MO) properties remain -qualitatively as well as quantitatively -poorly understood and today's MO applications rely solely on RE (Tb 3+ ) loaded glasses [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and magneto-optical quenching in (Mn^2+, Sr^2+) metaphosphate glasses

Winterstein¹,

Akamatsu²,

Möncke³

et al. 2013

Opt. Mater. Express

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Transition metal ions such as Mn 2+ , Fe 2+ , or Co 2+ provide an interesting alternative to rare earth dopants in optically active glasses. In terms of their magneto-optical properties, they are not yet very well exploited. Here, we report on the effect of Mn 2+ on Faraday rotation in a metaphosphate glass matrix along the join Mn x Sr 1-x (PO 3 ) 2 with x = 0...1. Mn 2+ shows small optical extinction in the visible spectral range and, compared to other transition metal ions, a high effective magnetic moment. At high Mn-levels, however, the magneto-optical activity of Mn 2+ is strongly quenched due to ionic clustering. The magnetic properties of the heavily Mn 2+ -loaded phosphate matrix are dominated by a superexchange interaction in the Mn 2+ -O-Mn 2+ bridge with antiparallel spin alignment between Mn 2+ and O 2species. The apparent paramagnetic potential of Mn 2+ species can therefore not be exploited at room temperature.

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Section: Introductionmentioning

confidence: 99%

Magnetic and magneto-optical quenching in (Mn^2+, Sr^2+) metaphosphate glasses

Winterstein¹,

Akamatsu²,

Möncke³

et al. 2013

Opt. Mater. Express

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“…In general, crystalline and amorphous solids, even with the same chemical composition, exhibit quite different magnetic properties from each other. 1 For example, BiFeO 3 crystal exhibits an antiferromagnetic ͑AFM͒ transition at Néel temperature, T N = 643 K, with weak ferromagnetism 2 while rapidly quenched amorphous BiFeO 3 film exhibits a transition from a paramagnetic ͑PM͒ to spin-glass ͑SG͒ phase at the SG transition temperature, T SG =20 K. 3 The AFM superexchange interaction via oxide ions is predominant in most of the magnetic amorphous oxides. [4][5][6][7][8][9] Due to the randomly distributed magnetic ions in amorphous oxides, the predominant AFM interaction causes geometrical magnetic frustration in the arrangement of magnetic moments.…”

Section: Introductionmentioning

confidence: 99%

“…This leads to the random freezing of magnetic moments, i.e., SG transition [4][5][6][7][8][9] and the drastic suppression of magnetic ordering temperature. 1,3 Thus, the amorphization of crystalline oxides with the predominant AFM interactions often brings about the SG behavior and the T SG 's of the amorphous oxides are much lower than T N 's of the crystalline counterparts.…”

Section: Introductionmentioning

confidence: 99%

Impact of amorphization on the magnetic properties ofEuO-TiO2system

et al. 2010

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Recently, we have reported amorphization-induced ferromagnetism in a magnetic oxide; whereas crystalline EuTiO 3 is an antiferromagnet, its amorphous counterpart shows a ferromagnetic transition. In this paper, we have investigated the magnetic properties of amorphous EuO-TiO 2 system in detail. The present compounds, i.e., amorphous EuTiO 3 and Eu 2 TiO 4 , exhibit a paramagnetic-ferromagnetic transition followed by a spin-glass transition upon cooling down, thereby being characterized as reentrant ferromagnets. Interestingly, the magnetic ordering temperatures of amorphous EuTiO 3 and Eu 2 TiO 4 are comparable to and higher than those of their crystalline counterparts, respectively, indicating the enhancement of ferromagnetic interactions by amorphization. The origin of these features is discussed in terms of both the essential structural difference between amorphous and crystalline oxides and the magnetism unique to the crystalline EuO-TiO 2 compounds. We also find a correlation between the magnitude of ferromagnetic interactions and the covalency of Eu-O bonds.

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“…1 Instead, short-range antiferromagnetic (AFM) superexchange interactions via 2p states of oxide ions are predominant in the magnetic oxide glasses, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] with some exceptions such as Eu 2+ -containing glasses, where ferromagnetic (FM) interactions prevail. [19][20][21][22][23] In a system where magnetic moments are located at randomly distributed cations, the short-range AFM interactions inevitably bring about magnetic frustrations of geometrical origin.…”

Section: Introductionmentioning

confidence: 98%

Magnetic properties of oxide glasses containing iron and rare-earth ions

et al. 2011

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Measurements of fundamental magnetic properties including not only dc and ac susceptibilities but also magnetic aging effects have been performed for aluminoborate glasses with high concentrations of iron and rare-earth R 3+ ions (R = Sm, Gd, and Tb) in order to give an insight into the magnetic structures and interactions in amorphous oxides containing both 3d transition metal and 4f rare-earth ions, which manifest magnetic interactions that differ from each other. We demonstrate that the antiferromagnetic interactions between iron and rare-earth ions as well as those between iron ions play a significant role for their magnetic properties, while those between rare-earth ions are of little importance. Most of the rare-earth ions remain paramagnetic even below the spin-freezing temperatures under the strong molecular field caused by the spin-glass freezing of the iron ions, as in the case of rare-earth garnet ferrites.

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Magnetic properties of the garnet and glass forms ofMn3Al2Si3O12

Cited by 24 publications

References 23 publications

Magnetic and magneto-optical quenching in (Mn^2+, Sr^2+) metaphosphate glasses

Magnetic and magneto-optical quenching in (Mn^2+, Sr^2+) metaphosphate glasses

Impact of amorphization on the magnetic properties ofEuO-TiO2system

Magnetic properties of oxide glasses containing iron and rare-earth ions

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