Exchange bias effect in ball milled Co–Cr2O3 FM–AFM nanocomposites

Mishra, Sanjay R.; Dubenko, Igor; Griffis, John; Ali, Naushad; Marasinghe, Kanishka

doi:10.1016/j.jallcom.2009.06.046

Cited by 24 publications

(11 citation statements)

References 38 publications

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“…36 However, note that the morphology of the present samples renders a 3D-ordered FM/AFM structure in contrast to most of the systems involving nanoparticles or 3D structures which exhibit a random distribution. 24,[37][38][39] Moreover, given the inverse dependence of H E on the FiM thickness 35 also exhibit large H C and H E values. 19 The temperature dependence of H C and H E (Fig.…”

Section: Resultsmentioning

confidence: 96%

Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

Pellicer¹,

Cabo²,

López‐Ortega³

et al. 2013

Nanoscale

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The controlled filling of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3-xO4 nanolayers is presented as a proof-of-concept toward the integration of nanosized units in highly ordered, heterostructured 3D architectures. Antiferromagnetic (AFM) Co3O4 mesostructures are obtained as negative replicas of KIT-6 silica templates, which are subsequently coated with ferrimagnetic (FiM) FexCo3-xO4 nanolayers. The tuneable magnetic properties, with a large exchange bias and coercivity, arising from the FiM/AFM interface coupling, confirm the microstructure of this novel two-phase core-shell mesoporous material. The present work demonstrates that ordered functional mesoporous 3D-materials can be successfully infiltrated with other compounds exhibiting additional functionalities yielding highly tuneable, versatile, non-siliceous based nanocomposites.

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Section: Resultsmentioning

confidence: 96%

Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

Pellicer¹,

Cabo²,

López‐Ortega³

et al. 2013

Nanoscale

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“…With lowering temperature, a spin-glass-like freezing of the grain boundary region occurs due to competition between exchange interaction between disorder spins and local surface-interface anisotropy. 14 As a consequence, the increase of the ZFC magnetization with temperature below T B can be interpreted as due to thermally activated transitions toward the spin configuration.…”

Section: Temperature Dependence Of the Magnetizationmentioning

confidence: 99%

“…12 Co-Cr 2 O 3 nanocomposites have also been prepared by thermal decomposition of the combined solution of the metal nitrates (Co(NO 3 ) 2 and Cr(NO 3 ) 3 ) 13 and mechanical ball milling of the mixture of Co and Cr 2 O 3 powders. 14 Moreover, ferrimagnetic Fe 3 O 4 and ferromagnetic CrO 2 were successfully composited with Cr 2 O 3 to present exchange bias effect. 15,16 Slinkin et al 17 have studied the magnetization and ferromagnetic resonance of Ni-Cr 2 O 3 composite, which was mainly used to identify the phase composition of metallic nickel in the product.…”

Section: Introductionmentioning

confidence: 99%

The ferromagnetic–antiferromagnetic properties of Ni–Cr₂O₃composite hollow spheres prepared by an in situ reduction method

et al. 2014

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Considerable efforts have been exerted on the facile synthesis of magnetic composite materials because of their unique properties and potential applications. Especially for ferromagnetic-antiferromagnetic systems, the magnetic exchange bias effect is essential for the development of magneto-electronic switching devices and magnetic storage media. In this research, a facile ethylene glycol in situ reduction strategy has been successfully employed in the preparation of Ni-Cr 2 O 3 composite hollow spheres. X-Ray powder diffraction was used to determine the phase composition. Scanning electron microscopy and transmission electron microscopy was employed to characterize the morphologies of the as-prepared samples. Experiments proved that the volume ratio of ethylene glycol to water played a determinative role in the final morphology of the products. The magnetization vs. temperature results revealed a spin-glass-like behavior with blocking temperature of about 150 K for the as-prepared Ni-Cr 2 O 3 composites. Induced by the coupling between ferromagnetic Ni and antiferromagnetic Cr 2 O 3 , a small exchange bias effect could be observed in the magnetic hysteresis loops. At lower temperature, a larger exchange bias field and coercivity are obtained. A high surface area of 145.1 m 2 g −1 was obtained for the prepared porous hollow spheres.

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“…Among all of the AFM materials, Cr 2 O 3 is one of the most important AFM 3d transition metal oxides and possesses a T N of about 307 K. Recently, Cr 2 O 3 based systems have attracted much attention in the study of exchange bias effect [14][15][16]. Most of the works were based on Cr 2 O 3 nanoparticles [14][15][16], and little attention was paid to the magnetic properties of Cr 2 O 3 based solid solutions system [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the works were based on Cr 2 O 3 nanoparticles [14][15][16], and little attention was paid to the magnetic properties of Cr 2 O 3 based solid solutions system [17][18][19]. Though high temperature magnetic properties of (Al 2 O 3 ) x (Cr 2 O 3 ) 1−x solid solutions were investigated [20], this system still lacks systematic study on the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Al2O3–Cr2O3 solid solutions

Yang¹,

Liu²,

Hua³

et al. 2011

Journal of Alloys and Compounds

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Exchange bias effect in ball milled Co–Cr2O3 FM–AFM nanocomposites

Cited by 24 publications

References 38 publications

Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

The ferromagnetic–antiferromagnetic properties of Ni–Cr₂O₃composite hollow spheres prepared by an in situ reduction method

Magnetic properties of Al2O3–Cr2O3 solid solutions

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Exchange bias effect in ball milled Co–Cr2O3 FM–AFM nanocomposites

Cited by 24 publications

References 38 publications

Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

The ferromagnetic–antiferromagnetic properties of Ni–Cr2O3composite hollow spheres prepared by an in situ reduction method

Magnetic properties of Al2O3–Cr2O3 solid solutions

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The ferromagnetic–antiferromagnetic properties of Ni–Cr₂O₃composite hollow spheres prepared by an in situ reduction method