Structural and magnetic properties of barium hexaferrites with Gd–Co substitution

Litsardakis, G.; Manolakis, Ioannis; Efthimiadis, K.G.

doi:10.1016/j.jallcom.2006.02.044

Cited by 58 publications

(24 citation statements)

References 25 publications

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“…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%

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Alsmadi

Bsoul

Mahmood

et al. 2013

Journal of Applied Physics

127

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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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Section: Introductionmentioning

confidence: 99%

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Alsmadi

Bsoul

Mahmood

et al. 2013

Journal of Applied Physics

127

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“…Different techniques have been used to prepare and characterize hexaferrite particles [7][8][9][10][11][12][13]. The magnetic properties of these materials have been tuned by substitution of Fe by different magnetic and nonmagnetic cations, and intensively investigated by different techniques [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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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“…Several studies on hexaferrites in which Fe ions are substituted by different cations or combinations of cations have been carried out to develop materials with improved characteristics suitable for technological applications. Among the recently investigated substitutions are Mn-Co-Zr [10], Ni-Ti [11], Gd-Co [12], Co-Ti [13][14][15], Co-Zr [16], Zr-Zn [17], Mn and Ti [18].…”

Section: Introductionmentioning

confidence: 99%