Size-dependent magnetic properties of branchlike nickel oxide nanocrystals | Zendy

Dan Liu | Zendy; Dongsheng Li | Zendy; Deren Yang | Zendy

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Size-dependent magnetic properties of branchlike nickel oxide nanocrystals

Author(s) -

Dan Liu,

Dongsheng Li,

Deren Yang

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4974307

Subject(s) - coercivity , materials science , ferromagnetism , condensed matter physics , magnetization , nickel , particle size , non blocking i/o , nanocrystal , nickel oxide , relaxation (psychology) , nanotechnology , chemistry , metallurgy , magnetic field , physics , psychology , social psychology , biochemistry , quantum mechanics , catalysis

Branchlike nickel oxide nanocrystals with narrow size distribution are obtained by a solution growth method. The size-dependent of magnetic properties of the nickel oxides were investigated. The results of magnetic characterization indicate that the NiO nanocrystals with size below 12.8 nm show very weak ferromagnetic state at room temperature due to the uncompensated spins. Both of the average blocking temperature (Tb) and the irreversible temperature (Tirr) increase with the increase of nanoparticle sizes, while both the remnant magnetization and the coercivity at 300 K increase with the decrease of the particle sizes. Moreover, the disappearance of two-magnon (2M) band and redshift of one-phonon longitudinal (1LO) and two-phonon LO in vibrational properties due to size reduction are observed. Compared to the one with the spherical morphological, it is also found that nano-structured nickel oxides with the branchlike morphology have larger remnant magnetization and the coercivity at 5 K due to their larger surface-to-volume ratio and greater degree of broken symmetry at the surface or the higher proportion of broken bonds

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