Laser-induced modulation of Magnon and Phonon excitations: Size and defect dependency in antiferromagnetic NiO nanoparticles with rhombohedral distortion

Adiba Adiba , Ph Nonglen Meitei , Tufail Ahmad
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Abstract

NiO nanoparticles were synthesized using jasmine flower and orange peel. The transition from cubic to rhombohedral phase was observed with peak splitting in the XRD patterns as the annealing temperature increased. Differences in the annealing environment resulted in particles with different crystallite sizes and amounts of nickel vacancy, directly impacting their magnetic properties. Notably, particles below 30 nm exhibited weak ferromagnetism, while those above 30 nm showed antiferromagnetic properties. Moreover, the power of the laser was tuned to 5 mW to achieve the disappearance of the 2 M peak. A key highlight of this work is the identification of the transverse acoustic phonon mode and the splitting of the transverse optical (TO) mode in NiO.

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激光诱导的 Magnon 和 Phonon 激发调制:具有斜方体畸变的反铁磁性氧化镍纳米粒子的尺寸和缺陷依赖性
利用茉莉花和橘子皮合成了纳米氧化镍颗粒。随着退火温度的升高,X 射线衍射图谱中出现了峰分裂,观察到了立方相向斜方相的转变。退火环境的不同会导致颗粒的结晶尺寸和镍空位量不同,从而直接影响其磁性能。值得注意的是,30 纳米以下的颗粒表现出弱铁磁性,而 30 纳米以上的颗粒则表现出反铁磁性。此外,将激光功率调至 5 mW 可使 2 M 峰值消失。这项工作的一大亮点是确定了氧化镍中的横向声子模式和横向光学(TO)模式的分裂。
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