Effect of shape and magnetocrystalline anisotropies in ordered Co nanorod arrays with smaller diameter

Sellarajan, Boominatha; Nagaraja, H.S.; Barshilia, Harish C.; Chowdhury, P.

doi:10.1016/j.jmmm.2015.12.010

Cited by 5 publications

(1 citation statement)

References 22 publications

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“…Magnetic properties of nanostructured materials like Co, Ni, Fe have been widely investigated [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These studies have usually indicated emergence of novel magnetic and transport properties as the dimension approaches the length scale of a few to tens of nm.…”

Section: Introductionmentioning

confidence: 99%

Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite

Nath

Sinha²,

Ali³

et al. 2017

J. Phys.: Condens. Matter

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By investigating temperature dependent structural and magnetic properties of cobalt (Co) embedded within nanoporous anodized alumina template, we observe changes in the easy axis of Co magnetization and an unusual increase in its saturation magnetization below a temperature T . Analysis of our M(H) data reveals that the magnetized volume of the sample increases rapidly as T falls below T. To understand these features we perform micro-magnetic simulations for a single Co-nanopillar wherein by varying its magneto-crystalline anisotropy energy we are able to show that the changes observed near T are related to the changes in the magnetic anisotropy of the nanopillar. We propose crystallographic structural distortions trigger changes in the balance between shape and magneto-crystalline anisotropy in our nanopillar. Our results suggest interplay between magnetism, structure and magnetic anisotropy in low dimensional Co-nanopillars, which can be modified with temperature of the system.

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Section: Introductionmentioning

confidence: 99%

Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite

Nath

Sinha²,

Ali³

et al. 2017

J. Phys.: Condens. Matter

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Shape Anisotropic Chain‐Like CoNi/Polydimethylsiloxane Composite Films with Excellent Low‐Frequency Microwave Absorption and High Thermal Conductivity

He,

Hu,

Yan

et al. 2024

Adv Funct Materials

109

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The demand for low‐frequency microwave absorption materials is becoming more and more urgent. Novel shape anisotropy chain‐like CoNi is fabricated using polyvinylpyrrolidone as a shape‐directing agent via solvothermal method, which is then mixed with polydimethylsiloxane (PDMS) to prepare corresponding multifunctional chain‐like CoNi/PDMS composite films. Shape anisotropy and strong magnetic coupling effect of chain‐like CoNi enhance natural resonance and magnetic loss capability. The minimum reflection loss (RLmin) is −50.5 dB and low‐frequency effective absorption bandwidth (EAB) is 1.04 GHz (2.64–3.68 GHz) at 3.9 mm for chain‐like CoNi. The corresponding 18 vol% chain‐like CoNi/PDMS composite films present optimal low‐frequency microwave absorption performance with RLmin of −56.7 dB and low‐frequency EAB of 1.04 GHz (2.96–4.00 GHz) at 4.1 mm, which is far superior to 18 vol% spherical CoNi/PDMS composite films with RLmin of −9.5 dB. Meantime, the in‐plane and inter‐plane thermal conductivity coefficients of 18 vol% chain‐like CoNi/PDMS composite films are 2.05 and 0.61 W m−1 K−1, about 1.5 times higher than 18 vol% spherical CoNi/PDMS composite films (1.36 and 0.42 W m−1 K−1), also 220% and 190% higher than pure PDMS (0.64 and 0.21 W m−1 K−1). This composite films with low‐frequency microwave absorption and thermal conductivity can broaden applications in 5G communications and flexible electronics.

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Synthesis of Highly Ordered Nanoporous Anodic Aluminium Oxide Templates and Template-Based Nanomaterials

Sellarajan

Ghosh

2022

Handbook on Synthesis Strategies for Advanced Materials

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Effect of shape and magnetocrystalline anisotropies in ordered Co nanorod arrays with smaller diameter

Cited by 5 publications

References 22 publications

Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite

Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite

Shape Anisotropic Chain‐Like CoNi/Polydimethylsiloxane Composite Films with Excellent Low‐Frequency Microwave Absorption and High Thermal Conductivity

Synthesis of Highly Ordered Nanoporous Anodic Aluminium Oxide Templates and Template-Based Nanomaterials

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