Modification of Helix in (Ba1-xSrx)2Zn2Fe12O22Due to Applied Magnetic Field

Momozawa, Nobuyuki; Yamaguchi, Yasuo; Takei, Hiroyuki; Mita, Masaru

doi:10.1143/jpsj.54.3895

Cited by 29 publications

(15 citation statements)

References 1 publication

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“…ions results in an enhancement of magnetization. In addition, the stepwise changes in M-H curve for hexaferrites was reported to indicate the H-induced phase transitions [25,26,41,42]. It is clear in Fig.…”

Section: Magnetic Studiesmentioning

confidence: 93%

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Liu

Gao

et al. 2016

J Mater Sci: Mater Electron

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Y-type hexaferrites Ba 2 Mg 2-x Co x Fe 12 O 22 (x = 0.4, 0.8, 1.2, 1.6) were synthesized by solid state reaction method. The impedance spectrum, AC conductivity, and dielectric properties were investigated at various temperatures and in a wide range of frequency. The dielectric properties and AC conductivity have been explained on the basis of space charge polarization and the electric exchange between Fe 3? and Fe 2? as well as the hole hopping between Co 2? and Co 3? ions at octahedral side. The complex impedance analysis indicates the existence of space charge and the presence of electrical processes at increased temperatures. The change of the activation energy obtained from lnf max versus 1/T and lnr dc versus 1/T plots indicated that with increasing Co content, the transport mechanisms at low and high temperatures are different. Two magnetic phase transitions were observed in these samples and their transition temperatures increased with increasing Co 2? doping. High Co content suppresses the second magnetic structure transition under an applied magnetic field. For all samples, the room temperature coercivity is less than 20 Oe, while the saturation magnetization increases with increasing Co content. The present work provides a fundamental understanding of the dielectric and conductivity mechanism of Mg 2 Y type hexaferrite, which is essential for microwave and electronic applications in the materials.

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Section: Magnetic Studiesmentioning

confidence: 93%

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Liu

Gao

et al. 2016

J Mater Sci: Mater Electron

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“…ZFO being a robust antiferromagnetic system, it is expected that the presence of ZFO may not significantly affect the magnetic properties of BZFO/BSZFO samples as investigated in the present work. [14][15][16][19][20][21]. It is to be noted that even in polycrystalline samples also such field induced transitions are reported [22].…”

Section: Resultsmentioning

confidence: 99%

“…The fundamental crystal structure of this system belongs to the R-3m space group with hexagonal structure. Magnetic structure of these compounds consists of spin blocks designated as S [Me 2 þ Fe 4 [19][20][21]. In Y-type hexaferite crystal structure, the Ba ions are situated near to the Fe sites.…”

Section: Introductionmentioning

confidence: 99%

In-field 57Fe Mössbauer study of multiferroic Ba0.5Sr1.5Zn2Fe12O22 Y-type hexaferrite

Raju

Reddy

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…This phenomenon can be understood by the superexchange interactions in the crystal lattice by different sizes of ions. The ionic size of Sr = 1.27Å is smaller than that of Ba = 1.43Å, and as a result, a local lattice deformation around Sr ions leads to a stronger superexchange interaction between Fe-O-Fe due to the change in the bond angles between them [Momozawa 1985, Utsumi 2007.…”

Section: Methodsmentioning

confidence: 99%

Ferrimagnetic Sr<formula formulatype="inline"><tex Notation="TeX">$_{1.5}$</tex></formula>Ba<formula formulatype="inline"><tex Notation="TeX"> $_{0.5}$</tex></formula>Zn<formula formulatype="inline"><tex Notation="TeX">$_2$</tex></formula>Fe<formula formulatype="inline"><tex Notation="TeX"> $_{12}$</tex> </formula>O<formula formulatype="inline"><tex Notation="TeX">$_{22}$</tex> </formula>

et al. 2011

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Single crystals of Sr 1.5 Ba 0.5 Zn 2 Fe 12 O 22 were grown from the flux systems of BaCO 3 , SrCO 3 , and Na 2 CO 3 by a high temperature, slow cooling, flux method. X-ray diffraction confirmed that the crystal structure is an extended single crystalline array of Zn-Y composition with an in-plane easy axis crystallographic orientation. The obtained single crystals were characterized for magnetic and microwave properties. The anisotropy field (H A ) and the in-plane magnetization (σ s ) were 10 kOe and 22.5 emu/g, respectively. Ferrimagnetic resonance (FMR) measurements showed 41 Oe of linewidth ( H) at 10 GHz.Index Terms-Soft magnetic materials, hexagonal ferrite, single crystal, planar anisotropy, and ferrimagnetic resonance.

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Modification of Helix in (Ba_1-xSr_x)₂Zn₂Fe₁₂O₂₂Due to Applied Magnetic Field

Cited by 29 publications

References 1 publication

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

In-field 57Fe Mössbauer study of multiferroic Ba0.5Sr1.5Zn2Fe12O22 Y-type hexaferrite

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