TY  - JOUR
AU  - Zhang, Yi
AU  - Murata, Hayaki
AU  - Hatsukade, Yoshimi
AU  - Tanaka, Saburo
TI  - Superparamagnetic nanoparticle detection using second harmonic of magnetization response
JO  - Review of scientific instruments
VL  - 84
IS  - 9
SN  - 0034-6748
CY  - [S.l.]
PB  - American Institute of Physics
M1  - FZJ-2013-06535
SP  - 094702 -
PY  - 2013
AB  - We introduce a method to improve the detection sensitivity for the magnetization M of superparamagnetic nanoparticles (MNP). The M response of MNP to an applied magnetic field H (M–H characteristics) could be divided into a linear region and a saturation region, which are separated at a transition point H k. When applying an excitation magnetic field (H ac ) with a frequency ω0 and an additional dc bias field H dc = H k, the second harmonic of M reaches the maximum due to the nonlinearity of the M–H characteristics. It is stronger than any other harmonics and responsible for small H ac without a threshold. The second harmonic selected as the readout criterion for M response of MNP is systematically analyzed and experimentally proven.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000325402000037
DO  - DOI:10.1063/1.4820447
UR  - https://juser.fz-juelich.de/record/141351
ER  -