The Scale of FePt Nanoparticles A 3.5 nm FePt particle Volume 22 nm 3 or 2.2 x 10 -20 cm 3

Metrology Needs for Magnetic NanoparticlesHow to Measure the Magnetic Properties of Individual Particles?David E. NiklesDepartment of Chemistry and Center for Materials for Information TechnologyThe University of Alabama, Tuscaloosa, Alabama 35487-0209 The Scale of FePt Nanoparticles A 3.5 nm FePt particle Volume 22 nm3 or 2.2 x 10-20 cm3 About 816 Fe atoms and 816 Pt atoms Mass 3.4 x 10-19 g Magnetization 2.5 x 10-17 emu Self-assembled FePt nanoparticles

Biomedical Applications of Magnetic Nanoparticles • BARC Biosensor • Chip for the multi-analyte assay of biomolecules • Uses • DNA hybridization • GMR sensing • Magnetic bead labeling • Detection of biowarfare agents Bead Array Counter (BARC) Illustration courtesy of D. T. Johnson, Department of Chemical Engineering, University of Alabama

The Scale of FePt Nanoparticles A 3.5 nm FePt particle Volume 22 nm 3 or 2.2 x 10 -20 cm 3

The Scale of FePt Nanoparticles A 3.5 nm FePt particle Volume 22 nm 3 or 2.2 x 10 -20 cm 3

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commoncause/nm

200 nm

Example: He-Ne Laser λ0 = 632.5 nm Δλ = 0.2 nm Diode Laser λ0 = 900 nm Δλ = 10 nm

500 nm

TITLE Synthesis and Applications of FePt and Their Composite Nanoparticles LECTURER

nm  nm oscillation sensitivity

Measured parameters: particle backscatter at 355 and 532 nm, particle extinction at 355 nm,

10 cm 3 soil

1 nm

Log 10 , 550 nm

NM Image

(nm)

Scale bar: (a) 20 nm, (b) 4 nm

NM 4203 Section 3

Nm]

200 nm

NM-np

5 nM

Introducing a 10-nm Particle Counter for Ultrapure Water

Example: He-Ne Laser λ0 = 632.5 nm Δλ = 0.2 nm Diode Laser λ0 = 900 nm Δλ = 10 nm