Influence of the cation distribution on the magnetization of Y-type hexagonal ferrites

Albanese, G.; Carbucicchio, M.; Deriu, A.; Asti, G.; Rinaldi, S.

doi:10.1007/bf00936028

Cited by 62 publications

(21 citation statements)

References 9 publications

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“…Considering the strength of magnetic interaction (or magnitude of hyperfine field) [2,4,5] and the site symmetry, we classified the six types of Fe 3+ into three groups: from the inner one, termed S 1 (6c IV , 6c VI , 3b VI ), S 2 (18h VI ), and S 3 (6c * IV , 3a VI ) for convenience. The intensity ratio should be S 1 :S 2 :S 3 = 1.67:2:1.…”

Section: Resultsmentioning

confidence: 99%

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Mössbauer study on Y-type hexaferrite Ba2Mg2Fe12O22

2011

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Mössbauer study on a Y-type hexaferrite Ba 2 Mg 2 Fe 12 O 22 has been conducted by using a single crystal specimen. The spins are in the c-plane down to 60 K. For 18h VI site Fe, the quadrupole shifts and the outermost line width change around 195 K, where the transition from ferrimagnetic to proper screw spin structure takes place. Below 50 K, the spin reorientation transition to a longitudinal conical structure was also recognized. At 16 K, the spins incline about 15 • from the c-plane.

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Section: Resultsmentioning

confidence: 99%

“…The magnetoelectric behavior, or multiferroic behavior, was also found, and thus the interests on this material have been revived. The Mössbauer spectroscopic studies on this material, however, have not been conducted so much [4,5]. This is presumably because of its complex spectrum originated from the six crystallographic Fe sites.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer study on Y-type hexaferrite Ba2Mg2Fe12O22

2011

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“…Y-type hexagonal ferrite is a potential candidate for these applications and has been attractive over years. The structure of Y-type hexaferrite has space group (R3m) and is often represented as [6]. These materials have planar magnetic anisotropy and due to this reason, their cut-off frequencies lie in GHz range, which is much higher than those of spinel ferrites.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent structural and magnetic behavior of Y-type hexagonal ferrites synthesized by sol–gel autocombustion

Ahmad

Ali

et al. 2015

Journal of Alloys and Compounds

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“…The partial replacement of Ba with Sr modifies the superexchange interaction of the Fe-O-Fe bonds and may stabilize the spiral magnetic state. Moreover, the presence of nonmagnetic ion such as Zn in the octahedral sites of T-block might cause a drastic change in the magnetic order 19 . In addition, it has been recognized that the weak planar magnetic anisotropy is very important for the realization of magnetically controllable ferroelectricity 9,17,18 .…”

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confidence: 99%

Low magnetic field reversal of electric polarization in a Y-type hexaferrite

Fen

Zou

et al. 2012

Applied Physics Letters

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Magnetoelectric multiferroics in which ferroelectricity and magnetism coexist have attracted extensive attention because they provide great opportunities for the mutual control of electric polarization by magnetic fields and magnetization by electric fields. From a practical point view, the main challenge in this field is to find proper multiferroic materials with a high operating temperature and great magnetoelectric sensitivity. Here we report on the magnetically tunable ferroelectricity and the giant magnetoelectric sensitivity up to 250 K in a Y-type hexaferrite, BaSrCoZnFe 11 AlO 22 . Not only the magnitude but also the sign of electric polarization can be effectively controlled by applying low magnetic fields (a few hundreds of Oe) that modifies the spiral magnetic structures. The magnetically induced ferroelectricity is stabilized even in zero magnetic field. Decayless reproducible flipping of electric polarization by oscillating low magnetic fields is shown. The maximum linear magnetoelectric coefficient reaches a high value of ~ 3.0×10 3 ps/m at 200 K.In the past several years, spiral magnetic order induced multiferroics and magnetoelectric (ME) effects have been observed in a number of transition metal oxides such as TbMnO 3 , RMn 2 O 5 , CoCr 2 O 4 , and others [1][2][3] . In these spiral magnets, the magnetic order and ferroelectricity are inherently coupled and thus pronounced ME effects could be expected. 4,5 The microscopic mechanism has been well described with the spin current model 6 or the inverse Dzyaloshinskii-Moriya (DM) interaction model 7 . However, the ME effects in these spiral magnets are not useful for practical applications because they occur at low temperatures and require a large magnetic field of several tesla. Recently, the hexaferrites with helical spin order have been suggested as promising candidates for high temperature multiferroics. It was reported that some Y-type hexaferrites, such as (Ba,Sr) 2 Zn 2 Fe 12 O 22 and Ba 2 Mg 2 Fe 12 O 22 , can show magnetically induced ferroelectricity and pronounced ME effects due to modifications of spiral magnetic structures by applying magnetic fields [8][9][10][11] . Although the magnetic ordering temperatures of these Y-type hexaferrites are above room temperature, their ME effects are observable only below ~ 130 K. Subsequently, ME effects were also observed in Z-type 12,13 , M-type 14 , and U-type 15 hexaferrites.Especially, the low field ME effect in a Z-type hexaferrite, Sr 3 Co 2 Fe 24 O 41 , happens at room temperature, representing a big step towards practical applications 12. Nevertheless, there are still some critical problems to be overcome. For instance, although magnetic control of electric polarization at room temperature has been achieved, the reversal of electric polarization by magnetic fields has been realized only at low temperatures 10,11,14 . We prepared the Y-type hexaferrites by solid state reaction in oxygen. The as-sintered samples are not insulating enough at high temperatures, and thus a post-annealing...

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Influence of the cation distribution on the magnetization of Y-type hexagonal ferrites

Cited by 62 publications

References 9 publications

Mössbauer study on Y-type hexaferrite Ba2Mg2Fe12O22

Mössbauer study on Y-type hexaferrite Ba2Mg2Fe12O22

Temperature dependent structural and magnetic behavior of Y-type hexagonal ferrites synthesized by sol–gel autocombustion

Low magnetic field reversal of electric polarization in a Y-type hexaferrite

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