The Coercivity of Hard Ferrite Single Crystals

Jahn, L.; Müller, Horst

doi:10.1002/pssb.19690350222

Cited by 53 publications

(22 citation statements)

References 19 publications

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“…These values were lower than the value (T C ≈ 730 K) reported [33,34] for the single phase barium hexaferrite compound. The lower T C values obtained is related to the substitution of B…”

Section: Resultscontrasting

confidence: 76%

Microstructural and magnetic properties of BaO‐Fe ₂ O ₃ –B ₂ O ₃ ‐SiO ₂ glass ceramic with ZrO ₂ as nucleating agent

Mirkazemi

Beitollahi

Marghussian

2004

phys. stat. sol. (c)

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In this work attempt is made to study the crystallization, microstructure, and magnetic properties of a glass composition of 35% BaO, 35% Fe 2 O 3 , 20% B 2 O 3 , 10% SiO 2 (mol%) without and with 1 mol% extra ZrO 2 as nucleating agent, using various techniques. The formation of BaFe 12 O 19 and BaB 2 O 4 phases as the only crystalline phases formed in a glassy amorphous matrix were confirmed for all of the heat treated samples at their respective DTA exo-peak temperatures. Based on TEM, XRD and DTA results obtained, it was shown that the addition of ZrO 2 promoted bulk crystallization in this system and also acted as a heterogeneous nucleation site for BaFe 12 O 19 phase. Although, the magnitudes of the saturation magnetization (M S ) of all of the heat treated samples were nearly in the same range (25-27 e.m.u./g), the values of the intrinsic coercive field ( i H C ) showed a mch wider range. The addition of ZrO 2 to the glass system studied, have generally gave rise to the decrease of the iH C values. This is thought to be related to the substitution of non-magnetic Zr 4+ ions for Fe 3+ in the barium hexaferrite lattice, weakening the superexhange interaction between Fe sites. The highest values of the i H C of the heat-treated base glass and ZrO 2 added samples were 304 kA/m and 280kA/m, respectively.

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“…These values were lower than the value (T C ≈ 730 K) reported [33,34] for the single phase barium hexaferrite compound. The lower T C values obtained is related to the substitution of B…”

Section: Resultscontrasting

confidence: 76%

Microstructural and magnetic properties of BaO‐Fe ₂ O ₃ –B ₂ O ₃ ‐SiO ₂ glass ceramic with ZrO ₂ as nucleating agent

Mirkazemi

Beitollahi

Marghussian

2004

phys. stat. sol. (c)

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“…34 At 300 K, the net magnetization doesn't become zero which shows that the Curie temperature lies beyond this temperature range. The Curie temperature in these hexaferrites was reported to be around 500 K. 35 Interestingly, the net magnetic moment increases with doping of Ce 4+ and Zn 2+ . As stated earlier, Zn 2+ , a non-magnetic ion, prefers 4f 1 site.…”

Section: Resultsmentioning

confidence: 96%

Investigation of crystal structure, microstructure and low temperature magnetic behavior of Ce⁴⁺ and Zn²⁺ co-doped barium hexaferrites (BaFe₁₂O₁₉)

et al. 2018

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“…The coercivity of LCM decreases linearly from a value of 35 Oe at 82 K (T c = 245 K), as the temperature is increased, whereas for SRH, the coercivity is very high (~ 3500 Oe) at low temperatures. Similarly, for NZF the coercivity decreases from 21 Oe at 323 K (T c = 750 K) compared to the high coercivity of SRF at room temperature (Jahn and Muller 1969). H c of SRF increases from ~ 4000 Oe at 323 K to ~ 5500 Oe at 473 K and decreases further to ~ 4000 Oe at 673 K, as the temperature is increased.…”

Section: Resultsmentioning

confidence: 91%

Comparison of the irreversible thermomagnetic behaviour of some ferro- and ferrimagnetic systems

2000

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The magnetic behaviour of two ferromagnetic oxides and two ferrimagnetic oxides (ferrites) are compared to study the effect of magnetocrystalline anisotropy on thermal-history-dependence of magnetization of these ordered magnetic systems. All four compounds show thermomagnetic irreversibility (M FC > M ZFC ) below a certain temperature, T irr . The highly anisotropic ferromagnetic oxide, SrRuO 3 and the hard ferrite, SrFe 12 O 19 show sharp peaks below T c in their M ZFC (T) curves, whereas for the soft ferrite Ni 0⋅ ⋅8 Zn 0⋅ ⋅2 Fe 2 O 4 and the low anisotropic ferromagnetic oxide La 0.7 Ca 0⋅ ⋅3 MnO 3 only a broad maximum is observed in M ZFC , when measured in small magnetic fields. The shapes of the M ZFC (T) curves are inversely-related to the magnitude of the coercivities (H c ) of the compounds in relation to the applied field, and the temperature dependence of H c . M FC and M ZFC are related through the coercivity for all four magnetic systems.

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The Coercivity of Hard Ferrite Single Crystals

Cited by 53 publications

References 19 publications

Microstructural and magnetic properties of BaO‐Fe ₂ O ₃ –B ₂ O ₃ ‐SiO ₂ glass ceramic with ZrO ₂ as nucleating agent

Microstructural and magnetic properties of BaO‐Fe ₂ O ₃ –B ₂ O ₃ ‐SiO ₂ glass ceramic with ZrO ₂ as nucleating agent

Investigation of crystal structure, microstructure and low temperature magnetic behavior of Ce⁴⁺ and Zn²⁺ co-doped barium hexaferrites (BaFe₁₂O₁₉)

Comparison of the irreversible thermomagnetic behaviour of some ferro- and ferrimagnetic systems

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The Coercivity of Hard Ferrite Single Crystals

Cited by 53 publications

References 19 publications

Microstructural and magnetic properties of BaO‐Fe 2 O 3 –B 2 O 3 ‐SiO 2 glass ceramic with ZrO 2 as nucleating agent

Microstructural and magnetic properties of BaO‐Fe 2 O 3 –B 2 O 3 ‐SiO 2 glass ceramic with ZrO 2 as nucleating agent

Investigation of crystal structure, microstructure and low temperature magnetic behavior of Ce4+ and Zn2+ co-doped barium hexaferrites (BaFe12O19)

Comparison of the irreversible thermomagnetic behaviour of some ferro- and ferrimagnetic systems

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Microstructural and magnetic properties of BaO‐Fe ₂ O ₃ –B ₂ O ₃ ‐SiO ₂ glass ceramic with ZrO ₂ as nucleating agent

Microstructural and magnetic properties of BaO‐Fe ₂ O ₃ –B ₂ O ₃ ‐SiO ₂ glass ceramic with ZrO ₂ as nucleating agent

Investigation of crystal structure, microstructure and low temperature magnetic behavior of Ce⁴⁺ and Zn²⁺ co-doped barium hexaferrites (BaFe₁₂O₁₉)