Thermosensitivity Through Exchange Coupling in Ferrimagnetic/Antiferromagnetic Nano-Objects for Magnetic Based Thermometry

Published

March 6, 2023

Author(s)

Frank Abel, Eduardo De Lima Correa, Adam Biacchi, Thinh Bui, Solomon I. Woods, Angela R. Hight Walker, Cindi L. Dennis

Abstract

Temperature is a fundamental physical quantity important to the physical and biological sciences. Measurement of temperature within an optically inaccessible three-dimensional (3D) volume at microscale resolution is currently limited. Thermal magnetic particle imaging (T-MPI), a temperature variant of magnetic particle imaging (MPI), hopes to solve this deficiency. For this thermometry technique, magnetic nano-objects (MNOs) with strong temperature-dependent magnetization (thermosensitivity) around the temperature of interest are required; here we focus between 200 K and 310 K. We demonstrate that thermosensitivity can be amplified in MNOs consisting of ferrimagnetic (FiM) iron oxide (ferrite) and antiferromagnetic (AFM) cobalt oxide (CoO) through interface effects. The FiM/AFM MNOs are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS), and Raman spectroscopy. The thermosensitivity is evaluated and quantified by temperature-dependent magnetic measurements. The FiM/AFM exchange coupling is confirmed by field-cooled (FC) hysteresis loops measured at 100 K. Magnetic particle spectroscopy (MPS) measurements were performed at room temperature to evaluate the MNOs MPI response. This initial study shows that FiM/AFM interfacial magnetic coupling is a viable method to increase thermosensitivity in MNOs for T-MPI.

Citation

ACS Applied Materials and Interfaces

Pub Type

Journals

Download Paper

https://doi.org/10.1021/acsami.2c19673

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Keywords

magnetic nano-objects, FiM/AFM exchange coupling, colloidal synthesis, thermal magnetic particle imaging, thermosensitivity

Citation

Abel, F. , De Lima Correa, E. , Biacchi, A. , Bui, T. , Woods, S. , Hight Walker, A. and Dennis, C. (2023), Thermosensitivity Through Exchange Coupling in Ferrimagnetic/Antiferromagnetic Nano-Objects for Magnetic Based Thermometry, ACS Applied Materials and Interfaces, [online], https://doi.org/10.1021/acsami.2c19673, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935415 (Accessed May 4, 2024)