%0 Journal Article
%A Zhang, Yi
%A Murata, Hayaki
%A Hatsukade, Yoshimi
%A Tanaka, Saburo
%T Superparamagnetic nanoparticle detection using second harmonic of magnetization response
%J Review of scientific instruments
%V 84
%N 9
%@ 0034-6748
%C [S.l.]
%I American Institute of Physics
%M FZJ-2013-06535
%P 094702 -
%D 2013
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000325402000037
%R 10.1063/1.4820447
%U https://juser.fz-juelich.de/record/141351