Uncompensated grain boundary spin driven exchange bias effect in granular NiO film

Das, Swapan Kumar; Giri, N.; Sarkar, Samrat; Mondal, A.; Majumdar, Shubhankar; Giri, S.; Ray, Rajat

doi:10.1016/j.ssc.2019.05.013

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…Numerous reports on the EB phenomenon [3][4][5][6][7][8][9][10][11] are published for articial interfaces in layered systems and magnetic nanoparticles having distinguishable surface anisotropy from that of the core. [12][13][14] On the other hand, a handful systems having spontaneous magnetic phase separation within a single crystallographic phase exhibiting the EB phenomenon have also been reported. Mixed-valent manganites and cobaltites with perovskite structure are the most prevailing examples of this kind where ferromagnetic droplets are spontaneously embedded in an antiferromagnetic back ground or spin glass/ cluster glass like matrix or ferrimagnetic background creating spontaneous FM/AFM 15 or FM/SG (or CG) 16,17 or FM/FI 18 interface.…”

Section: Introductionmentioning

confidence: 99%

Exchange bias and magnetic memory effect in hole doped Nd_0.78Sr_0.22CoO₃nanoparticles

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Exchange bias and magnetic memory effect in hole doped Nd_0.78Sr_0.22CoO₃nanoparticles

et al. 2022

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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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Fe–Co co-doping effects on antiferromagnetic core of NiO nanoparticles

Abbas

Nadeem

Munir

et al. 2022

Ceramics International

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Uncompensated grain boundary spin driven exchange bias effect in granular NiO film

Cited by 4 publications

References 35 publications

Exchange bias and magnetic memory effect in hole doped Nd_0.78Sr_0.22CoO₃nanoparticles

Exchange bias and magnetic memory effect in hole doped Nd_0.78Sr_0.22CoO₃nanoparticles

Magnetic homogeneity in Fe-Mn co-doped NiO nanoparticles

Fe–Co co-doping effects on antiferromagnetic core of NiO nanoparticles

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Uncompensated grain boundary spin driven exchange bias effect in granular NiO film

Cited by 4 publications

References 35 publications

Exchange bias and magnetic memory effect in hole doped Nd0.78Sr0.22CoO3nanoparticles

Exchange bias and magnetic memory effect in hole doped Nd0.78Sr0.22CoO3nanoparticles

Magnetic homogeneity in Fe-Mn co-doped NiO nanoparticles

Fe–Co co-doping effects on antiferromagnetic core of NiO nanoparticles

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Product

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Exchange bias and magnetic memory effect in hole doped Nd_0.78Sr_0.22CoO₃nanoparticles

Exchange bias and magnetic memory effect in hole doped Nd_0.78Sr_0.22CoO₃nanoparticles