Spin Relaxation of Gd2O3/NiFe2O4 Core-Shell Nanoparticles

被引：4
作者：
Rajesh, A. [1 ]
Dutta, Alo [2 ]
Gurunathan, K. [1 ]
Sinha, T. P. [2 ]
机构：
[1] Alagappa Univ, Dept Nanosci & Technol, Alagappa 630004, Tamil Nadu, India
[2] Bose Inst, Dept Phys, Kolkata 700009, India
来源：
NANOSCIENCE AND NANOTECHNOLOGY LETTERS | 2014年 / 6卷 / 05期
关键词：
Core-Shell Nanoparticles; Polyol Method; HRTEM; Electron Paramagnetic Resonance; MAGNETIC-RESONANCE; CARBON NANOTUBES; NANOMATERIALS; BEHAVIOR;
D O I：
10.1166/nnl.2014.1705
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Nickel ferrite encapsulated gadolinium oxide (Gd2O3/NiFe2O4) core-shell nanoparticles (NPs) has been synthesized by polyol method and analyzed by transmission electron microscope (TEM). The particle size is found to vary from 10 nm to 24 nm. The dynamics of magnetic moment has been studied with the help of temperature dependent electron paramagnetic resonance (EPR) spectroscopy. Peak-to-peak line width (Delta H-pp) and 'g' value of the EPR spectra are found to increase with the decrease of temperature. The sample has the lowest value of both these parameters at room temperature, which indicates that Gd2O3/NiFe2O4 shows minimum loss and is suitable for high frequency devices. Temperature dependence of line width shows the dominance of spin-spin relaxation in this system. Spin number estimated from EPR studies increases while the spin-spin relaxation time (T-2) decreases with decreasing temperature. The effect of temperature on the magnetic properties of the Gd2O3/NiFe2O4 core/shell NPs and the underlying mechanisms have been discussed.
引用
收藏
页码：450 / 455
页数：6
相关论文
共 33 条
  • [21] Exchange bias in Fe/Fe3O4 core-shell magnetic nanoparticles mediated by frozen interfacial spins
    Ong, Quy Khac
    Wei, Alexander
    Lin, Xiao-Min
    [J]. PHYSICAL REVIEW B, 2009, 80 (13):
  • [22] Raber JF., 1980, EXPT METHODS POLYM C
  • [23] Increasing the complexity of magnetic core/shell structured nanocomposites for biological applications
    Salgueirino-Maceira, Veronica
    Correa-Duarte, Miguel A.
    [J]. ADVANCED MATERIALS, 2007, 19 (23) : 4131 - 4144
  • [24] RELAXATION PHENOMENA IN NANOSTRUCTURED ZINC FERRITE
    Singh, Jitendra Pal
    Srivastava, R. C.
    Agrawal, H. M.
    Chand, Prem
    [J]. INTERNATIONAL JOURNAL OF NANOSCIENCE, 2009, 8 (06) : 523 - 531
  • [25] STUCKI JW, 1980, ADV CHEM METHODS SOI
  • [26] Ferromagnetism as a universal feature of nanoparticles of the otherwise nonmagnetic oxides
    Sundaresan, A.
    Bhargavi, R.
    Rangarajan, N.
    Siddesh, U.
    Rao, C. N. R.
    [J]. PHYSICAL REVIEW B, 2006, 74 (16):
  • [27] Thiang N. G. C., 2012, COSMOS, V8, P103
  • [28] Multifunctional composite core-shell nanoparticles
    Wei, Suying
    Wang, Qiang
    Zhu, Jiahua
    Sun, Luyi
    Lin, Hongfei
    Guo, Zhanhu
    [J]. NANOSCALE, 2011, 3 (11) : 4474 - 4502
  • [29] Variable temperature electron paramagnetic resonance studies of the NiZn ferrite/SiO2 nanocomposite
    Wu, KH
    Chang, YC
    Chen, HB
    Yang, CC
    Horng, DN
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004, 278 (1-2) : 156 - 163
  • [30] Superparamagnetic behavior and AC-losses in NiFe2O4 nanoparticles
    Yelenich, O. V.
    Solopan, S. O.
    Kolodiazhnyi, T. V.
    Dzyublyuk, V. V.
    Tovstolytkin, A. I.
    Belous, A. G.
    [J]. SOLID STATE SCIENCES, 2013, 20 : 115 - 119
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