We estimated the effective magnetic anisotropy constant K of magnetic nanoparticles (MNPs) from the temperature dependence of the coercive field Hc of the M–H curve for use in biosensing applications. For this purpose, a previous analytical expression for Hc was extended so that it can be applied to nanoparticles with a size distribution. Using the extended expression for Hc, we estimated the K value of multi-core based MNP sample that consists of crystalline aggregates of elementary particles. We prepared three MNP samples. One is Resovist, in which elementary particles and aggregates are mixed. The Resovist sample was magnetically divided into two fractions called MS1 and MS3, which included mainly aggregates and elementary particles, respectively. We discuss the K value of elementary particles and aggregates from the comparison among the three samples. It is suggested that the K value of the aggregates is much smaller than that of the elementary particles. The temperature dependence of K of the aggregates is also discussed.
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7 April 2020
Research Article|
April 03 2020
Estimation of the effective magnetic anisotropy constant of multi-core based magnetic nanoparticles from the temperature dependence of the coercive field
Keiji Enpuku
;
Keiji Enpuku
a)
1
Department of Electrical and Electronic Engineering, Kyushu University
, Fukuoka 819-0395, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Ahmed L. Elrefai;
Ahmed L. Elrefai
1
Department of Electrical and Electronic Engineering, Kyushu University
, Fukuoka 819-0395, Japan
2
Department of Electrical Power and Machines, Cairo University
, Giza 12613, Egypt
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Takashi Yoshida;
Takashi Yoshida
1
Department of Electrical and Electronic Engineering, Kyushu University
, Fukuoka 819-0395, Japan
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Tamara Kahmann;
Tamara Kahmann
3
Institute of Electrical Measurement Science and Fundamental Electrical Engineering
, TU Braunschweig
, 38106 Braunschweig, Germany
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Jing Zhong
;
Jing Zhong
3
Institute of Electrical Measurement Science and Fundamental Electrical Engineering
, TU Braunschweig
, 38106 Braunschweig, Germany
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Thilo Viereck
;
Thilo Viereck
3
Institute of Electrical Measurement Science and Fundamental Electrical Engineering
, TU Braunschweig
, 38106 Braunschweig, Germany
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Frank Ludwig
Frank Ludwig
3
Institute of Electrical Measurement Science and Fundamental Electrical Engineering
, TU Braunschweig
, 38106 Braunschweig, Germany
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a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 127, 133903 (2020)
Article history
Received:
January 10 2020
Accepted:
March 24 2020
Citation
Keiji Enpuku, Ahmed L. Elrefai, Takashi Yoshida, Tamara Kahmann, Jing Zhong, Thilo Viereck, Frank Ludwig; Estimation of the effective magnetic anisotropy constant of multi-core based magnetic nanoparticles from the temperature dependence of the coercive field. J. Appl. Phys. 7 April 2020; 127 (13): 133903. https://doi.org/10.1063/1.5144713
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