Magnetic Properties of Nanorods

Krahne, Roman; Manna, Liberato; Morello, Giovanni; Figuerola, Albert; George, Chandramohan; Deka, Sasanka

doi:10.1007/978-3-642-36430-3_5

Cited by 2 publications

(3 citation statements)

References 213 publications

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“…Surface anisotropy energy comes from the atoms located at the material’s surface since they have incomplete coordination spheres and a broken symmetry compared to the core atoms. Such a decrease in the crystalline symmetry at the surface induces a different orientation of the surface spins with respect to the magnetization direction . This energy is negligible for bulk materials with small specific surface areas compared to other energies.…”

Section: Magnetic Energy and Interactionsmentioning

confidence: 99%

“…However, in some cases, shrinking magnetic materials to nano- or microscale induces a comparable or even dominant contribution to magnetic anisotropy. The surface anisotropy energy can be expressed as E s u r f a c e = K s u r f a c e ∫ S cos 2 nobreak0em.25em⁡ θ nobreak0em0.25em⁡ normald S where K surface is the surface anisotropy density constant, θ is the angle between the magnetization and the normal to the surface. The sign of the surface energy depends on the nature of the crystal lattice and the surface orientation.…”

Section: Magnetic Energy and Interactionsmentioning

confidence: 99%

“…Such a decrease in the crystalline symmetry at the surface induces a different orientation of the surface spins with respect to the magnetization direction. 68 This energy is negligible for bulk materials with small specific surface areas compared to other energies. However, in some cases, shrinking magnetic materials to nano- or microscale induces a comparable or even dominant contribution to magnetic anisotropy.…”

Section: Magnetic Energy and Interactionsmentioning

confidence: 99%

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The wide accessibility to nanostructures with high uniformity and controllable sizes and morphologies provides great opportunities for creating complex superstructures with unique functionalities. Employing anisotropic nanostructures as the building blocks significantly enriches the superstructural phases, while their orientational control for obtaining long-range orders has remained a significant challenge. One solution is to introduce magnetic components into the anisotropic nanostructures to enable precise control of their orientations and positions in the superstructures by manipulating magnetic interactions. Recognizing the importance of magnetic anisotropy in colloidal assembly, we provide here an overview of magnetic field-guided self-assembly of magnetic nanoparticles with typical anisotropic shapes, including rods, cubes, plates, and peanuts. The Review starts with discussing the magnetic energy of nanoparticles, appreciating the vital roles of magneto-crystalline and shape anisotropies in determining the easy magnetization direction of the anisotropic nanostructures. It then introduces superstructures assembled from various magnetic building blocks and summarizes their unique properties and intriguing applications. It concludes with a discussion of remaining challenges and an outlook of future research opportunities that the magnetic assembly strategy may offer for colloidal assembly.

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Section: Magnetic Energy and Interactionsmentioning

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confidence: 99%

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confidence: 99%

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Magnetically Active Carbon Nanotubes at Work

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et al. 2015

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Endohedral and exohedral assembly of magnetic nanoparticles (MNPs) and carbon nanotubes (CNTs) recently gave birth to a large body of new hybrid nanomaterials (MNPs-CNTs) featuring properties that are otherwise not in reach with only the graphitic or metallic cores themselves. These materials feature enhanced magnetically guided motions (rotation and translation), magnetic saturation and coercivity, large surface area, and thermal stability. By guiding the reader through the most significant examples in this Concept paper, we describe how researchers in the field engineered and exploited the synergistic combination of these two types of nanoparticles in a large variety of current and potential applications, such as magnetic fluid hyperthermia therapeutics and in magnetic resonance imaging to name a few.

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Magnetic Properties of Nanorods

Cited by 2 publications

References 213 publications

Magnetically Induced Anisotropic Interaction in Colloidal Assembly

Magnetically Induced Anisotropic Interaction in Colloidal Assembly

Magnetically Active Carbon Nanotubes at Work

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