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Superparamagnetic nanoparticle ensembles [PDF]

Superlattices and Microstructures, 2010
Magnetic single-domain nanoparticles constitute an important model system in magnetism. In particular ensembles of superparamagnetic nanoparticles can exhibit a rich variety of different behaviors depending on the inter-particle interactions. Starting from isolated single-domain ferro- or ferrimagnetic nanoparticles the magnetization behavior of both ...
Oleg Petracic
exaly   +3 more sources

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Superparamagnetism in hematite

Earth and Planetary Science Letters, 1967
It is well known that small particles of ferromagnetic material show superparamagnetic behavior. The magnetic properties of hematite, which has a weak spontaneous magnetization show superparamagnetic behavior in grains which are as large as 1/4 to 1/2 μ in diameter.
D.W. Strangway, B.E. McMahon, R.M. Honea, E.E. Larson   +3 more
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Interaction of superparamagnetic and non-superparamagnetic particles in magnetic fluid

Journal of Magnetism and Magnetic Materials, 1995
Magnetic fluids are known to contain superparamagnetic and non-superparamagnetic particles. In this paper, an attempt has been made to show the interaction between superparamagnetic and non-superparamagnetic particles experimentally by measuring the initial susceptibility, over a wide temperature range, of manganese-zinc ferrite and cobalt ferrite ...
B. Jeyadevan, K. Nakatsuka
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Superparamagnetic Photonic Crystals

Advanced Materials, 2001
Photonic crystals consisting of monodisperse superparamagnetic colloidal particles have been synthesized. The particles (see Figure) are obtained by emulsion polymerization of styrene in the presence of freshly precipitated surface-modified iron oxide nanoparticles.
Sara A. Majetich, Sanford A Asher
exaly   +2 more sources

Superparamagnetic nanoparticles in tap water

Water Research, 2007
Magnetization measurements are a useful tool in the characterization of corrosion products formed in municipal water pipes made of iron or steel. Fine particles formed in corrosion processes exhibit superparamagnetic behavior. The size of such particles, which determines their capacity to adsorb hazardous species, can therefore be found from magnetic ...
Frank E, Senftle, Arthur N, Thorpe, Julius R, Grant, Aaron, Barkatt   +3 more
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Cobalt-Based Superparamagnetic Nanorings

Nano Letters, 2004
Remarkable optical and magnetic properties were observed in a Co-thiol-polymer composite. The Co and the thiol ligand used to passivate the Co surface, instead of generating isolated nanoparticles, grow into nanorings with a radius around 2 nm. These structures consist of small clusters of metallic Co connected by alkylthiol chains.
Marin-Almazo, M, Garcia-Gutierrez, D, Gao, X, Elechiguerra, JL, Kusuma, VA, Sampson, WM, Miki-Yoshida, M, Dalton, AB, Escudero, R, Jose-Yacaman, M   +9 more
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Multifunctional Superparamagnetic Janus Particles

Langmuir, 2009
In this study, we report the microfluidic-based synthesis of a multifunctional Janus hydrogel particle with anisotropic superparamagnetic properties and chemical composition for the bottom-up assembly of hydrogel superstructures. In a uniform magnetic field, the resulting Janus magnetic particles fabricated in the present method exhibit chainlike or ...
Kai P, Yuet, Dae Kun, Hwang, Ramin, Haghgooie, Patrick S, Doyle   +3 more
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Degeneration of biogenic superparamagnetic magnetite

Geobiology, 2009
ABSTRACTMagnetite crystals precipitated as a consequence of Fe(III) reduction by Shewanella algae BrY after 265 h incubation and 5‐year anaerobic storage were investigated with transmission electron microscopy, Mössbauer spectroscopy and X‐ray diffraction. The magnetite crystals were typically superparamagnetic with an approximate size of 13 nm.
Vali, H, Konhauser, K, Pfiffner, SM, Phelps, TJ, Dyar, MD, Rondinone, AJ, Cole, DR, Li, YL   +7 more
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Superparamagnetic enhancement of thermoelectric performance

Nature, 2017
The ability to control chemical and physical structuring at the nanometre scale is important for developing high-performance thermoelectric materials. Progress in this area has been achieved mainly by enhancing phonon scattering and consequently decreasing the thermal conductivity of the lattice through the design of either interface structures at ...
Wenyu, Zhao, Zhiyuan, Liu, Zhigang, Sun, Qingjie, Zhang, Ping, Wei, Xin, Mu, Hongyu, Zhou, Cuncheng, Li, Shifang, Ma, Danqi, He, Pengxia, Ji, Wanting, Zhu, Xiaolei, Nie, Xianli, Su, Xinfeng, Tang, Baogen, Shen, Xiaoli, Dong, Jihui, Yang, Yong, Liu, Jing, Shi   +19 more
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Transition in spin dependent transport from superparamagnetic-superparamagnetic to superparamagnetic-ferromagnetic in sputtered Cu100–xCox granular films

Journal of Applied Physics, 2012
The transition in the spin-dependent transport from superparamagnetic-superparamagnetic (SPM-SPM) to superparamagnetic-ferromagnetic (SPM-FM) in room temperature co-sputtered granular Cu100−xCox (x = 15.1–30.9 at. %) thin films is tracked by varying the cobalt concentration.
Dinesh Kumar, Sujeet Chaudhary, Dinesh K. Pandya   +2 more
openaire   +1 more source