Room Temperature Magnetic Memory Effect in Cluster-Glassy Fe-Doped NiO Nanoparticles

Gandhi, Ashish Chhaganlal; Li, Tai-Yue; Kumar, Bharat; Reddy, P. Muralidhar; Peng, Jen-Chih; Wu, Chun‐Ming; Wu, Sheng Yun

doi:10.3390/nano10071318

Cited by 13 publications

(5 citation statements)

References 51 publications

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“…Among several NCs, the multi-phasic magnetic nanoparticles have attracted profound attention among researchers as the magnetic properties of such materials are intensely connected with the contact between differently ordered magnetic phases along with the interfacial interactions [3,8]. As the properties can be tailored via manipulating synthesis conditions [9], chemical compositions and phase fractions of components [3,4,10,11], magnetic NCs find applications in energy storage devices [12], spintronic devices [13], magnetic contrast agent [14], catalyst [15], high-density magnetic storage media [16], Li-ion batteries [17,18], drug delivery [6], permanents magnets [19][20][21], etc. Particularly bimagnetic NCs having ferromagnetic (FM)/AFM or ferrimagnetic (FIM)/AFM phases have been exploited for achievable applications such as hypothermia treatment [22], spin valve [23,24], ultrahigh-density recording heads [25], tunnel junction [26], sensing device [27], magnetic memory element [28], etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe₂O₄ nanocomposites

Sahu,

Panigrahi,

Chakravarty

et al. 2024

Phys. Scr.

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The impact of annealing time on the structural, optical, and magnetic characteristics of NiO/NiFe2O4 nanocomposites (NCs) was examined after successful synthesis via a straightforward economical wet chemical method. X-ray diffraction (XRD) characterization reveals the presence of cubic NiO as the predominant phase along with the minor phase fraction of NiFe2O4. Slight growth in the crystallite size from 38.96 to 40.25 nm is noticed with the rise of annealing duration. The suppression of intensity of the 2M Raman mode of NiO matrix confirms the decreasing trend of antiferromagnetic (AFM) correlations with the elevation of annealing time. The band gap of the samples increased from 3.38 to 3.98 eV upon increasing the annealing duration. The samples showed strong emissions in the UV region along with other visible emissions. The CIE chromatographic image of the samples indicated the shift of colour emission from blue to the near green region with increasing annealing time. Magnetization data suggests the presence of weak ferromagnetic feature in the background of the AFM NiO matrix at 300 K. The remanent magnetization of the samples increased slightly from ∼0.23 to 0.27 emu g−1 with increasing annealing duration along with perseverance of exchange bias (EB) in all samples at room temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe₂O₄ nanocomposites

Sahu,

Panigrahi,

Chakravarty

et al. 2024

Phys. Scr.

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“…However, so far, the appearance of only low-temperature MME from γ-Fe 2 O 3 far below the room temperature (RT) has hindered its use in composite materials for a potential application. In the past, the RT MME has been achieved through introducing additional magnetic anisotropy either by exchange-coupling, particle size distribution, or the inter-/intra-particle interactions [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Magnetic Memory Effect in Nanodiamond/γ-Fe2O3 Composites

et al. 2021

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We report a room temperature magnetic memory effect (RT-MME) from magnetic nanodiamond (MND) (ND)/γ-Fe2O3 nanocomposites. The detailed crystal structural analysis of the diluted MND was performed by synchrotron radiation X-ray diffraction, revealing the composite nature of MND having 99 and 1% weight fraction ND and γ-Fe2O3 phases, respectively. The magnetic measurements carried out using a DC SQUID magnetometer show the non-interacting superparamagnetic nature of γ-Fe2O3 nanoparticles in MND have a wide distribution in the blocking temperature. Using different temperature, field, and time relaxation protocols, the memory phenomenon in the DC magnetization has been observed at room temperature (RT). These findings suggest that the dynamics of MND are governed by a wide distribution of particle relaxation times, which arise from the distribution of γ-Fe2O3 nanoparticle size. The observed RT ferromagnetism coupled with MME in MND will find potential applications in ND-based spintronics.

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“…The research on magnetic materials in the nanometer-range size regime is steadily growing due to its potential applications in various fields such as magnetic recording devices, magnetic resonance imaging, and biomedicine [1][2][3][4][5]. Nickel oxide (NiO) is a promising antiferromagnetic (AFM) material with unusual magnetic properties, which have been reported in many studies [6][7][8][9][10][11][12][13][14]. The spins of the Ni 2+ ions are aligned within the (111) plane with AFM exchange coupling to the adjacent (111) plane below its Néel temperature (T N = 523 K) [15].…”

Section: Introductionmentioning

confidence: 99%

Magnetic homogeneity in Fe-Mn co-doped NiO nanoparticles

et al. 2020

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The effect of Fe and Mn co-doping on the magnetic properties of the antiferromagnetic (AFM) NiO nanoparticles which offer large potential for different magnetic applications have been studied. The Rietveld refinement fitting of powder x-ray diffractometry (XRD) patterns confirmed the phase formation of face-centred cubic crystal structure of NiO and average crystallite size lies in the short range of 32–38 nm. The cavity and broadband ferromagnetic resonance (FMR) measurements taken at room temperature demonstrate the smaller local magnetic inhomogeneity for 4%Mn-4%Fe co-doped NiO nanoparticles as compared to undoped, single doped and co-doped with different concentration NiO nanoparticles. The M-H loops revealed the room temperature ferromagnetism-like behaviour for higher Fe doping concentration and lower Mn doping concentration. This can be attributed to the double exchange interaction. The zero field cooled (ZFC) and field cooled (FC) dc magnetization curves showed a small surface freezing peak (at at low temperatures and a blocking peak (at at higher temperatures. For samples with 4%Mn-4%Fe and 2%Mn-6%Fe, the blocking peak was found at a relatively high temperature in comparison to other samples. This can be attributed to the presence of magnetic exchange interactions which block the magnetic spins against a thermal increase. The ZFC AC-susceptibility showed three peaks; a surface freezing peak at Tf, a blocking peak at TB peak and an anomalous peak at Tx in between and , which was found to be most prominent for the 4%Mn-4%Fe co-doped nanoparticles. The neutron diffraction pattern confirmed the AFM order of the core of the 4%Mn-4%Fe co-doped nanoparticles, which indicates an AFM coupling between the Fe2+ and Mn2+ ions and the Ni2+ ions through super-exchange interaction. Therefore, the origin of TX peak can be attributed to the ferromagnetic coupling between the Fe2+ and Mn2+ ions which has a maximum strength at equal concentration. Thus, small and equal doping concentration of Fe and Mn in NiO nanoparticles increase the magnetic homogeneity which makes them attractive for magnetic applications.

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Room Temperature Magnetic Memory Effect in Cluster-Glassy Fe-Doped NiO Nanoparticles

Cited by 13 publications

References 51 publications

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe₂O₄ nanocomposites

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe₂O₄ nanocomposites

Room Temperature Magnetic Memory Effect in Nanodiamond/γ-Fe2O3 Composites

Magnetic homogeneity in Fe-Mn co-doped NiO nanoparticles

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Room Temperature Magnetic Memory Effect in Cluster-Glassy Fe-Doped NiO Nanoparticles

Cited by 13 publications

References 51 publications

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe2O4 nanocomposites

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe2O4 nanocomposites

Room Temperature Magnetic Memory Effect in Nanodiamond/γ-Fe2O3 Composites

Magnetic homogeneity in Fe-Mn co-doped NiO nanoparticles

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Product

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Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe₂O₄ nanocomposites

Effect of annealing duration on the structural, optical and magnetic properties of NiO/NiFe₂O₄ nanocomposites