FePt : Al₂O₃nanocomposite thin films synthesized by magnetic trapping assisted pulsed laser deposition with reduced intergranular exchange coupling

Abstract

FePt : Al2O3 nanocomposite thin films synthesized by magnetic trapping (MT) assisted pulsed laser deposition (PLD) were found to have lower transition temperature for L10 face-centred-tetragonal (fct) phase due to higher concentration of defects. The low phase transition temperature together with non-magnetic matrix materials helps to reduce grain growth and agglomeration during annealing. Small remanence ratio and coercive squareness for nanocomposite thin films annealed at 300 °C to fct phase confirm that the main intergranular interaction is magnetostatic interaction rather than exchange coupling. The MT assisted PLD can synthesize fct-FePt : Al2O3 nanocomposite thin films with reduced intergranular exchange coupling.

Structure and magnetic properties of magnetron-sputtered [(Fe/Pt/Fe)/Au]n multilayer films

“…The high processing temperature results in large grains and increasing media noise, which are the main disadvantages for practical recording applications of the film. Recently, many methods have been adopted to reduce the processing temperature, such as the introduction of underlayer [10][11][12][13] or top layer [14], the addition of third elements [15,16], multilayering [17][18][19], ion irradiation [20,21], in situ annealing [22][23][24], alternate monatomic layer deposition [25], and dynamic stress-induced ordering [26], and so on.…”

CoPt–Al2O3 Nanocomposite Films: Synthesis, Structure, and Magnetic Properties

“…Тонкие пленки FePd, FePt и CoPt, упорядоченные по типу L1 0 , обладают большой константой магнитной анизотропии K 1 (K 1 > 3 × 10 7 эрг/см 3 ) с осью легкого намагничивания, расположенной перпендикулярно поверхности пленки (так называемая перпендикулярная магнитная анизотропия). Нанокомпозитные пленки, которые содержат изолированные высококоэрцитивные L1 0 -кластеры, вложенные в немагнитную матрицу [18][19][20][21][22][23][24][25], могут быть использованы для магнитной записи информации с высокой плотностью.…”

“…В настоящее время имеется небольшое количество работ, посвященных получению и исследованию нанокомпозитов, содержащих наночастицы L1 0 -CoPt и L1 0 -FePt в оксидных матрицах [18,19,[22][23][24][25]. Для практических применений такие исследования необходимы, чтобы получать нанокомпозиты с заданными магнитными, структурными и транспортными свойствами.…”

Magnetic and Structure Properties of CoPt-In₂O₃ Nanocomposite Films

“…CoPt and FePt alloy films have attracted a great deal of attention because of their strong perpendicular magnetic anisotropy, which is important for many practical applications. To date, there have been a small number of studies on the synthesis and investigation of nanocomposites containing CoPt and FePt nanoparticles in oxide matrices [20][21][22][23][24][25][26]. These investigations are important for applications involving the synthesis of nanocomposites with the desired magnetic, structural, and transport properties.…”