TY - JOUR
T1 - Magnetic measurements of suspended functionalised ferromagnetic beads under DC applied fields
AU - De Los Santos V., Luis
AU - Llandro, Justin
AU - Lee, Dongwook
AU - Mitrelias, Thanos
AU - Palfreyman, Justin J.
AU - Hayward, Thomas J.
AU - Cooper, Jos
AU - Bland, J. A.C.
AU - Barnes, Crispin H.W.
AU - Arroyo C., Juan L.
AU - Lees, Martin
PY - 2009/7/1
Y1 - 2009/7/1
N2 - In this work, a simple technique to obtain the hysteresis loops of magnetic beads (Spherotech Inc.) in liquid suspension is presented. The magnetic measurements were taken in a DC Magnetic Property Measurement System (MPMS-SQUID sensor). Samples were based on ferromagnetic beads (surface-functionalized NH2, mean diameter 4.32 μm) prepared in three conditions: dry, suspended in sucrose solution and in suspension after functionalization with fluorophore. Special small containers (1.3 cm long) made of non magnetic plastic were designed to hold the beads in liquid. The results indicate that the bead's remnant magnetization is half of the value at maximum applied field in all cases. However, due to the additional degrees of rotational freedom, beads suspended in a liquid do not present coercivity. The use of ferromagnetic beads and magnetic elements of different architectures for applications in bioassays is also discussed. Crown
AB - In this work, a simple technique to obtain the hysteresis loops of magnetic beads (Spherotech Inc.) in liquid suspension is presented. The magnetic measurements were taken in a DC Magnetic Property Measurement System (MPMS-SQUID sensor). Samples were based on ferromagnetic beads (surface-functionalized NH2, mean diameter 4.32 μm) prepared in three conditions: dry, suspended in sucrose solution and in suspension after functionalization with fluorophore. Special small containers (1.3 cm long) made of non magnetic plastic were designed to hold the beads in liquid. The results indicate that the bead's remnant magnetization is half of the value at maximum applied field in all cases. However, due to the additional degrees of rotational freedom, beads suspended in a liquid do not present coercivity. The use of ferromagnetic beads and magnetic elements of different architectures for applications in bioassays is also discussed. Crown
KW - Magnetic hysteresis
KW - Magnetic material
KW - Magnetoelectric effect
KW - Magnetoelectronic
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U2 - 10.1016/j.jmmm.2009.01.019
DO - 10.1016/j.jmmm.2009.01.019
M3 - Article
AN - SCOPUS:65349162071
VL - 321
SP - 2129
EP - 2134
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 14
ER -