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首页> 外文期刊>Journal of Applied Physics >Temperature dependence and magnetocrystalline anisotropy studies of self-assembled L1_0-Fe_(55)Pt_(45) ferromagnetic nanocrystals
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Temperature dependence and magnetocrystalline anisotropy studies of self-assembled L1_0-Fe_(55)Pt_(45) ferromagnetic nanocrystals

机译：自组装L1_0-Fe_（55）Pt_（45）铁磁纳米晶体的温度依赖性和磁晶各向异性研究

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摘要

Temperature dependence and uniaxial magnetocrystalline anisotropy properties of the chemically synthesized 4 nm L1_0-Fe_(55)Pt_(45) nanoparticle assembly by a modified polyol route are reported. As-prepared nanoparticles are superparamagnetic presenting fcc structure, and annealing at 550 ℃ converts the assembly into ferromagnetic nanocrystals with large coercivity (H_c> 1 T) in an L1_0 phase. Magnetic measurements showed an increasing in the ferromagnetically ordered fraction of the nanoparticles with the annealing temperature increases, and the remanence ratio, S=M_R/M_S ≈ 0.16, suggests an (111) textured film. A monotonic increase of the blocking temperature T_B, the uniaxial magnetocrystalline anisotropy constant K_U, and the coercivity H_c with increasing annealing temperature was observed. Magnetic parameters indicate an enhancement in the magnetic properties due to the improved Fe_(55)Pt_(45) phase stabilizing, and the room-temperature stability parameter of 67, which indicates that the magnetization should be stable for more than ten years, makes this material suitable for ultrahigh-density magnetic recording application.
机译：报道了通过修饰的多元醇途径化学合成的4 nm L1_0-Fe_（55）Pt_（45）纳米粒子组件的温度依赖性和单轴磁晶各向异性。制备的纳米粒子具有超顺磁性，呈现fcc结构，在550℃退火可将组装体转变为L1_0相中具有大矫顽力（H_c> 1 T）的铁磁性纳米晶体。磁性测量结果显示，随着退火温度的升高，纳米颗粒的铁磁有序部分增加，剩磁比S = M_R / M_S≈0.16表示形成（111）织构化膜。观察到随着退火温度的升高，阻塞温度T_B，单轴磁晶各向异性常数K_U和矫顽力H_c单调增加。磁性参数表明由于改善了Fe_（55）Pt_（45）的相稳定性而增强了磁性能，而室温稳定性参数67则表明磁化强度应该稳定十多年，这使得该特性得以实现。适用于超高密度磁记录应用的材料。

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