Structural and magnetic properties of BaFe12−2xTixRuxO19

Bsoul, Ibrahim; Mahmood, Sami H.; Lehlooh, Abdel-Fatah

doi:10.1016/j.jallcom.2010.03.142

Cited by 53 publications

(32 citation statements)

References 41 publications

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“…The small initial drop in coercivity and slow decrease in saturation magnetization for x values up to 0.2 are consistent with the substitution of Ga at spin-up 2a and spin-down 4f 1 sites with preference for occupying 2a sites. This is consistent with the substitution of small amounts of Ti-Ru at these sites as confirmed by Mossbauer spectroscopy [26]. For higher x values, spin-up 12k sites which contribute negatively to the anisotropy field start getting occupied by Ga ions, leading to the observed increase in coercivity and decrease in saturation magnetization.…”

Section: Fig 2 Tem Images Of Bafesupporting

confidence: 85%

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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Abstract. In this article, the thermomagnetic properties of a system of Ga-substituted barium hexaferrite nanoparticles (BaFe 12-x Ga x O 19 ) prepared by ball milling were investigated. The thermomagnetic curves for the samples with x ranging from 0.0 to 1.0 exhibited sharp peaks with high magnetization just below T C (Hopkinson peaks). The height of the peak for our samples was similar or larger than previously observed or calculated values. Theoretical treatment of the experimental data demonstrated that the peaks are due to the effect of superparamagnetic relaxations of the magnetic particle. This effect was confirmed by hysteresis measurements at, and just below the temperature at which the peak occurred. Consequently, the particle diameters were calculated from the experimental data using a theoretical model based on the superparamagnetic behavior of a system of uniaxial, randomly oriented, single domain, non-interacting particles. The calculated diameters of 11 -26 nm are less than the physical diameters determined from TEM measurements. The factors responsible for the low calculated values are discussed.

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Section: Fig 2 Tem Images Of Bafesupporting

confidence: 85%

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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“…All samples were prepared by ball milling and extracted from the same batch we used in our previous studies [27,33] h. Further detailed explanation of this treatment is given in references [27,33]. The phase purity and crystallite sizes in the synthesized samples were checked by x-ray diffraction, and the particle size was determined from the scanning electron microscopy (SEM) imaging.…”

Section: Methodsmentioning

confidence: 99%

“…It was found that small amounts of Co 2+ and Ti 4+ substituting for Fe 3+ in BaFe 12-2x Co x Ti x O 19 , can substantially reduce the coercive field, H C , with only a littlie change in saturation magnetization [28,29,30,31,32,33,34]. On the other hand, with Ru-Ti substitution, the saturation magnetization at room temperature was found to increase up to x = 0.2, and then to decrease for higher x values, while the coercivity decreases monotonically, recording a reduction of about 55% at x = 0.4 [27]. These properties, in addition to the large saturation magnetization, good chemical stability, and low switching field distribution make these compounds useful in high density and perpendicular recording.…”

Section: Introductionmentioning

confidence: 95%

“…Different cations such as Al [17], Ga, Sc, In [18,19], and various cationic combination such as, Ni-Ti [20], Co-Zr [21], Co-Sn [22], Zr-Zn [23], Co-Gd [24], Mn-Ti [25], Ni-Ru, Zn-Ru [26], Ti-Ru [27], and Co-Ti [28,29], were substituted for Fe in Barium hexaferrites. These substitutions were found to cause modifications of the magnetic properties and induce significant changes in several substituted systems.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Alsmadi

Bsoul

Mahmood

et al. 2013

Journal of Applied Physics

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124

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Co-Ti and Ru-Ti substituted barium ferrite nanocrystalline particles BaFe 12-2x ) were prepared by ball milling method, and their magnetic properties and their temperature dependencies were studied. The zero-field-cooled (ZFC) and field-cooled (FC) processes were recorded at low magnetic fields and the ZFC curves displayed a broad peak at a temperature T M . In all samples under investigation, a clear irreversibility between the ZFC and FC curves was observed below room temperature, and this irreversibility disappeared above room temperature. These results were discussed within the framework of random particle assembly model and associated with the magnetic domain wall motion. The resistivity data show some kind of a transition from insulator to perfect insulator around M T . At 2 K, the saturation magnetization slightly decreased and the coercivity dropped dramatically with increasing the Co-Ti concentration x. With Ru-Ti substitution, the 2 saturation magnetization showed small variations, while the coercivity decreased monotonically, recording a reduction of about 73% at x = 0.6. These results were discussed in light of the single ion anisotropy model and the cationic distributions based on previously reported neutron diffraction data for the CoTi substituted system, and the results of our Mössbauer spectroscopy data for the RuTi substituted system.

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“…Hasil ini sesuai dengan kajian literatur yang menyimpulkan bahwa low level substitution pada BHF mengubah parameter kisi c namun parameter kisi a cenderung konstan [12]. Perubahan kecil pada x = 0.4 menunjukan pengisian pada 2a dan [13,14], diperlihatkan pada GAMBAR 2. Peningkatan logaritmik ukuran kristalit dengan bertambahnya substitusi.…”

Section: Hasil Dan Pembahasanunclassified

PENGARUH SUBSITUSI ION (TI2+,MN4+) terhadap UKURAN PARTIKEL dan SIFAT MAGNET dari BARIUM HEKSAFERRIT DENGAN METODA MILLING dan ULTRASONIK TEKANAN TINGGI

Novizal

Sasito

Manawan

2016

SPEKTRA

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AbstrakTelah dibuat material BaFe12-2x TixMnxO19 ferrit hasil subsitusi dari BHF dengan (Ti 2+ -Mn 4+ ) untuk variasi komposisi x = 0,0, 0,2, 0,4, 0,6 dan 0,8. Material diproses dengan metoda Milling dan dilanjutkan dengan sonikasi. Dilakukan analisa terhadap ukuran partikel dan sifat magnet dari material dengan menggunakan peralatan PSA (particle size analyzer), XRD (X-ray diffraction) dan Permagraph EP.3 magnetometer. Dari sampel yang dianalisa dengan XRD diperoleh ukuran Kristal dibawah 70 nm untuk semua sampel, dari PSA didapat ukuran partikel berkisar 200-400 nm, dari data ini berarti setiap butir partikel merupakan polikristalin. Dilakukan sonikasi selama 6 jam dan diperoleh distribusi partikel untuk x = 0.0 berkisar 49,21 nm dan untuk x = 0,6 dan 0,8 berkisar 120,2 -209,5 nm. Proses ini menunjukkan bahwa proses sonikasi bisa memperkecil ukuran partikel. Sifat magnetik yang dikarakterisasi menggunakan magnetometer menunjukkan magnetisasi saturasi meningkat hingga komposisi x = 0,4 dan penurunan untuk substitusi lebih lanjut, sedangkan nilai koersivitas tetap menurun monoton dengan meningkatnya substitusi. Penurunan ukuran partikel dari 200-50 nm, memberi perubahan terhadap sifat magnet material dari hard menjadi soft magnet dengan koersivitas , tertera pada table 2.Kata-kata kunci: BHF, substitusi, mechanical alloying, sonikasi, nanopartikel, saturasi, koersivitas. AbstractThis research has been made on the material BaFe12-2x TixM xO19 ferrite substituted with (Ti 2+ -Mn 4+ ) with variation of composition x = 0.0, 0.2, 0.4, 0.6 and 0.8. by sonication. Analyzing the particle size and magnetic properties of a material using equipment PSA (particle size analyzer), XRD (X-ray diffraction) and Permagraph EP.3 magnetometer. The result of the XRD analyzed obtained crystal size below 70 nm for all samples, obtained from the PSA particle size range 200-400 nm, from the results of this means that every item is a polycrystalline particles. The prosesing sonication for 6 hours and the particle distribution obtained for x = 0.0 nm and ranges from 49.21 to x = 0.6 and 0.8 range 120,2-209.5 nm. This process shows that the sonication process could reduce the size of the particles. Magnetic properties were characterized using a magnetometer showed saturation magnetization rises to the composition x = 0.4 and decline to further substitution, while the value of coercivity permanent decreases monotonically with increasing substitution. So that decreasing particle size of 200-50 nm, giving a change to the magnetic properties of the hard material becomes soft magnetic coercivity, listed in Table 2.

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Structural and magnetic properties of BaFe12−2xTixRuxO19

Cited by 53 publications

References 41 publications

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

PENGARUH SUBSITUSI ION (TI2+,MN4+) terhadap UKURAN PARTIKEL dan SIFAT MAGNET dari BARIUM HEKSAFERRIT DENGAN METODA MILLING dan ULTRASONIK TEKANAN TINGGI

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Structural and magnetic properties of BaFe12−2xTixRuxO19

Cited by 53 publications

References 41 publications

Hopkinson peak and superparamagnetic effects in BaFe12-xGaxO19nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe12-xGaxO19nanoparticles

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

PENGARUH SUBSITUSI ION (TI2+,MN4+) terhadap UKURAN PARTIKEL dan SIFAT MAGNET dari BARIUM HEKSAFERRIT DENGAN METODA MILLING dan ULTRASONIK TEKANAN TINGGI

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Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles