Epitaxial Pb–Fe–O film with large planar magnetic anisotropy on (0001) sapphire

Abstract

Articles you may be interested inEnhanced magnetism and ferroelectricity in epitaxial Pb(Zr0.52Ti0.48)O3/CoFe2O4/La0.7Sr0.3MnO3 multiferroic heterostructures grown using dual-laser ablation technique

Pb cation induced low-temperature crystallization of (Ba⋅Pb) hexa-ferrite thin films

“…The ionic radius of Pb cations is 1.40Å smaller than that of Ba cations (1.61Å) [11]. Pb is more volatile element than Ba [5] and Pb hexa-ferrite has much lower melting temperature (1315 • C) compared to Ba hexa-ferrite (1565 • C) [6]. Therefore, Pb cations can diffuse into the Fe 3 O 4 phase more easily than Ba, resulting in the low temperature crystallization (< 550 • C) of the (Ba·Pb) hexa-ferrite.…”

“…Therefore, the substitution of Pb for Ba in the hexa-ferrite structure was investigated to reduce the crystallization temperature. Previous studies showed that the Pb substituted Ba hexa-ferrite film such as PbFe 12 O 19 and (Ba 1−x Pb x ) Fe 12 O 19 film crystallized at a lower substrate temperature than Ba hexa-ferrite film [5,6]. However, the role of substitutional Pb ions in the low-temperature crystallization and the crystallization behavior of Pb substituted Ba hexa-ferrite film have not been well understood.…”

“…The substrate temperature necessary for crystallization of Ba hexa-ferrite was ∼900 • C, which is not compatible with most commercially used substrate materials such as glass [5]. Therefore, the substitution of Pb for Ba in the hexa-ferrite structure was investigated to reduce the crystallization temperature.…”

Magnetic properties of c-axis oriented Sr0.8La0.2Fe11.8Co0.2O19 ferrite film prepared by chemical solution deposition

“…In order to reduce the grain sizes of SrM films, some methods have been applied to fabricate SrM films, including the RF sputtering method [12], metal-organic chemical vapor deposition [13], and laser ablation [14]. However, most of the methods mentioned above cannot be commercially used on large-scale films on account of the requirements of high vacuum and high depositing temperature.…”

The optimum synthesis of high coercivity Pb–M hexaferrite powders using modifications to the traditional ceramic route

“…The search of materials with more and more small particles-or it is in thin film or powder form-that has high values of saturation magnetization (M s ) and coercive field (iH c ), has renewed the interest about the Pb-M compound. Their peculiarity to crystallize to temperatures lower than their similar Ba-and Sr-M turns to this compound the great interest for the magnetic recording media [1][2][3]. However the obtention of Pb-M by the traditional ceramic route is considerably affected by the low temperature of evaporation of the PbO (950 C), which is not compatible with the high temperatures used of heat treatments in these method (1200-1400 C) [4].…”