Thickness dependence of structural and magnetic properties of FePt films

Lim, Brian Y.; Chen, Jingsheng; Wang, Jianping

doi:10.1016/j.jmmm.2003.09.052

Cited by 15 publications

(3 citation statements)

References 13 publications

(9 reference statements)

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“…The crystal orientations for both as-deposited and annealed samples are related to fcc structure, where no typical (001) diffraction patterns are observed. Above results from HRTEM clearly indicate that no ordered L1 0 phase induced by thermal annealing is formed in FePt layer, which is mainly attributed to ultrathin thickness [27] and low annealing temperature [28]. Therefore, it is reasonable to conclude that no obvious microstructural changes take place during the annealing process (below than 350 • C).…”

Section: Resultsmentioning

confidence: 88%

Magnetization reorientation induced by interfacial structures in ultrathin disordered FePt film sandwiched by SiO2 layers

Yang

Zhang

Wang

et al. 2015

Applied Surface Science

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Section: Resultsmentioning

confidence: 88%

Magnetization reorientation induced by interfacial structures in ultrathin disordered FePt film sandwiched by SiO2 layers

Yang

Zhang

Wang

et al. 2015

Applied Surface Science

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“…This trend may result from the increase in the degree of L1 0 chemical ordering with increasing thickness. [20,21] Lim et al [22] reported that the ordering parameter decreases from 0.8 to 0.5 as FePt film thickness decreases from 40 to 10 nm. It is reasonable that as the lateral dimension of the nanostripes decreases, the ordering parameters decrease as well, even though this dimension is over many lattice spacings.…”

Section: Resultsmentioning

confidence: 99%

FePt nano-stripes fabricated on anodic aluminum oxide templates

et al. 2015

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A new FePt nanostructure with stripe-like patterns has been prepared by direct current (DC) magnetron sputtering on anodic aluminum oxide (AAO) templates. AAO templates anodized under low voltages (7 V) demonstrate self-organized, maze-like patterns, different from the conventional porous structures obtained at high voltages. FePt thin films deposited on such templates tend to replicate the morphology of the templates. Although there is no obvious spatial ordering, the dimensions of the FePt nano-stripes are highly uniform, due to the constrained growth along the transverse direction of the AAO pattern. The magnetic properties are strongly influenced by this unique morphology. While continuous films demonstrate strong exchange coupling, the dominant interaction in FePt nano-stripes with the same nominal thickness is magnetostatic. The morphology also dictates the magnetization reversal behaviors, with thin films dominated by domain nucleation; while nano-stripes incline to reverse their magnetization by spin rotation. Our work demonstrates that self-organized AAO templates can be used to control the morphology and magnetic behavior of FePt materials.

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“…[4][5][6][7][8] For example, Berry and Barmak 4 modeled the time-temperature-transformation reaction diagram of fcc→ L1 0 phase transformation based on differential scanning calorimetry experiments, which, along with the experimentally measured L1 0 phase fraction of annealed FePt films ͑10 nm thick͒ by Ristau and co-workers, 9,10 demonstrated that the phase transformation is more difficult in thin FePt films ͑10 and 50 nm͒ than in thick films ͑1 m͒. Other studies, 5-8 primarily based on magnetic properties, have reported an increase in coercivity with increasing thickness, implying a similar thickness dependence.…”

Section: Introductionmentioning

confidence: 99%

Thickness dependence of structure and magnetic properties of annealed [Fe/Pt]n multilayer films

Yao

Coffey

2009

Journal of Applied Physics

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The L10 FePt phase material has potential applications for magnetic recording and permanent magnets due to its high magnetocrystalline anisotropy energy density. The heat treatment of [Fe/Pt]n multilayer films is one approach to form the L10 FePt phase at a lower processing temperature, which is highly desirable for its applications. This paper reports the influence of film total thickness (8–100 nm) on the structure and magnetic properties of annealed [Fe/Pt]n multilayer films. A novel technique based on hollow cone dark field transmission electron microscopy is used to determine the L10 phase fraction and grain size in the annealed films. It was found that the L10 phase fraction and grain size, ordering, and magnetic properties are strongly dependent on the total film thicknesses. An L10 FePt phase fraction close to 100% is achieved for a thick [Fe/Pt]n multilayer film (100 nm) annealed at 400 °C for 1 h, while a value of only 36% is achieved for a thin film (8 nm) annealed at the same condition. In this work the L10 FePt phase nucleation density is also presented. These results suggest that the L10 phase formation is nucleation limited, and that the subsequent growth of L10 phase grains also strongly influences the structure and magnetic properties of the annealed films.

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Thickness dependence of structural and magnetic properties of FePt films

Cited by 15 publications

References 13 publications

Magnetization reorientation induced by interfacial structures in ultrathin disordered FePt film sandwiched by SiO2 layers

Magnetization reorientation induced by interfacial structures in ultrathin disordered FePt film sandwiched by SiO2 layers

FePt nano-stripes fabricated on anodic aluminum oxide templates

Thickness dependence of structure and magnetic properties of annealed [Fe/Pt]n multilayer films

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