Magnetic properties of La–Co substituted barium ferrite thin films with large magnetic anisotropy

Application of FORC distributions to the study of magnetic interactions in ferrites of composition

“…Substituted hexaferrite systems like Ba 1Àx La x Fe 12Àx Co x O 19 and Sr 1Àx La x Fe 12Àx Co x O 19 have been and still are of considerable interest from both a fundamental and a technological perspective, and much effort has been devoted to characterizing their structural and magnetic properties [1][2][3][4]. While some progress has been achieved in improving the magnetic characteristics of sintered magnets made with theses materials, a detailed description of the coercivity mechanism could improve the performance of this kind of magnets.…”

Preparation and magnetic properties of La–Mn and La–Co doped barium hexaferrites prepared via an improved co-precipitation/molten salt method

“…The doped products synthesized here at relatively lower temperatures with the improved approach give M s and H c values comparable to those obtained with the higher temperature approaches. [17,27] …”

“…In these studies, the magnetic properties of ferrites were changed by substituting Fe 3 + with other cations. The magnetic properties of ferrites can also be changed by substituting Ba 2 + (or Sr 2 + ) with La 3 + (or Pr 3 + , Gd 3 + ), [17][18][19][20], which alters the Fe 3 + -O-Fe 3 + super-exchange interaction, or along with lanthanide-doping, substituting Fe 3 + with ions such as Zn 2 + [21-23] Sn 4 + , Mn 2 + [24], and Co 2 + [25][26][27]. Mn 2 + was adopted as a dopant because it has the same number of unpaired electrons as Fe 3 + and would therefore provide a useful comparison to our previous work [16].…”

Preparation, and magnetic and electromagnetic properties of La-doped strontium ferrite films

“…Spinels can be used in the 3-30 GHz band [6]. Simultaneously, especially hexagonal ferrite materials are of great interest used as potential media in the 1-100 GHz band for magnetic recording material and microwave absorbers in the field of aeronautics and astronautics [9][10][11][12][13][14][15], because they possess high magnetic loss tangent, coercive force and saturation magnetization, good mechanical rigidity and chemical stability, and huge uniaxial magnetic anisotropy. Otherwise the absorbers depend on magnetic polarization attenuation such as magnetic hysteresis loss, domain wall resonance, after effect loss [9,[16][17][18].…”