Neutron diffraction and magnetic properties of Ba2Co2Fe12O22: Co2Y

Rhee, Chan Hyuk; Lim, Jeeyoung; Kim, Chul Sung; Kim, Sung Baek

doi:10.3938/jkps.62.1919

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…The latter is likely to correspond to the magnetic transition from the collinear ferrimagnetic to the spiral magnetic structure. 8,39 T N and T S were derived from the inflection points defined by the minimum of dM/dT from the M-T curve. Fig.…”

Section: E Magnetic Propertiesmentioning

confidence: 99%

Analysis of the alternating current conductivity and magnetic behaviors for the polycrystalline Y-type Ba0.5Sr1.5Co2(Fe1-xAlx)12O22 hexaferrites

Zhong

Gao

et al. 2014

Journal of Applied Physics

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Co2Y hexaferrites have attracted intensive interests due to its potential high temperature magnetoelectricity as the single phase multiferroics. Numerous efforts have been paid to enhance their magnetoelectric properties at high temperatures through increasing the magnetic transition temperature and decreasing the conductivity. In this work, we investigated the conductivity and magnetic properties of the polycrystalline Ba0.5Sr1.5Co2(Fe1−xAlx)12O22 (0 ≤ x ≤ 0.12) hexaferrites and found that Al-doping has important effects on both the conductivity and magnetic properties. The underlying physical mechanisms were also systematically analyzed. Most importantly, a very much enhanced resistivity (over 10 MΩ cm), and a high magnetic transition temperature (∼346 K) have been obtained at a doping amount of x = 0.04. These improvements are very promising for achieving significant magnetoelectric effect at room temperature. The current research can provide the basic understanding of the Y-type ferrites for future applications in magnetoelectric and other fields.

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Section: E Magnetic Propertiesmentioning

confidence: 99%

Analysis of the alternating current conductivity and magnetic behaviors for the polycrystalline Y-type Ba0.5Sr1.5Co2(Fe1-xAlx)12O22 hexaferrites

Zhong

Gao

et al. 2014

Journal of Applied Physics

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“…The changes in both temperature dependencies indicating phase transitions take place in the vicinity of 183 and 40 K. The low-temperature phase transition from a helical to a conical spin ordering is more clearly observed in the samples prepared by sonochemical co-precipitation due to the development of large particles of a well-defined hexagonal shape when this techniques is used. Rhee et al investigated the ZFC magnetization changes for Ba 2 Co 2 Fe 12 O 22 in a magnetic field of 100 Oe; they observed the magnetic phase transition from a helimagnetic spin ordering to a ferromagnetic one to take place at 215 K and determined the T N to be 615 K. The Néel temperature is higher than that for Ba 2 Mg 2 Fe 12 O 22 and Ba 2 Zn 2 Fe 12 O 22 due to the presence of the magnetic Co 2+ cation leading to stronger superexchange interactions Co 2+ –O 2– –Fe 3+ (Co 2+ ). Lim et al .…”

Section: Magnetic Phase Transitionsmentioning

confidence: 96%

“…The powders are homogenized by ball-milling and, after palletization, are synthesized at a high temperature in the 1100–1200 °C range to obtain single-phase Y-type hexaferrite. Rhee et al synthesized Ba 2 Co 2 Fe 12 O 22 at 1200 °C in an oxygen atmosphere to reduce the number of oxygen defects. The samples produced have particle sizes from a few to ten microns. , Although the solid-state reaction route is simple and accessible, the large particle size and the homogeneity of the final product can be a problem for certain applications; also, the temperatures required to complete the reaction are usually high, which may be inconvenient for a later large-scale reproducible production.…”

Section: Synthesis Techniques Of Y-type Hexaferritesmentioning

confidence: 99%

Phase Transitions in Magneto-Electric Hexaferrites

et al. 2022

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Hexaferrites have long been the object of extensive studies because of their great possibility for applications�permanent magnets, highdensity recording media, microwave devices, in biomedicine, to name but a few. Lately, many researchers' efforts have been focused on the existence of the magneto-electric effect in some hexaferrite systems and the appealing possibility of them being used as single-phase multiferroic and magnetoelectric materials. As indicated by theoretical analyses, the origin of the large magneto-electric effect can be sought in the strong interaction between the magnetization and the electric polarization that coexist in insulators with noncollinear magnetic structures. The hexaferrites' magnetic structure and, particularly, the specific magnetic spin ordering are the key factors in observing magneto-electric phases in hexaferrites. Some of these phases are metastable, which hampers their direct practical use. However, as the hexaferrites' phase diagrams reveal, chemical doping can be used to prepare a number of noncollinear stable magnetic phases. Since the magneto-electric effect has to do with the magnetic moments ordering, it seems only logical that one should study the cation substitutions' influence on the magnetic phase transition temperature. In this paper, we summarize recent examples of advances in the exploration of magnetic phase transitions in Y-type hexaferrites. In particular, the effect is emphasized by substituting in Y-type hexaferrites the nonmagnetic Me 2+ cations with magnetic ones and of the magnetic Fe 3+ cations with nonmagnetic ones on their magnetic properties and magnetic phase transitions. The work deals with the structural properties of and the magnetic phase transitions in a specific Y-type hexaferrite, namely, Ba(Sr) 2 Me 2 Fe 12 O 22 .

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