Title :
Magneto-dielectric and magnetic anisotropy maxima in γ-Fe2O3 nanocomposite
Author :
Banerjee, Indradip ; Kim, Hyungsuk K. D. ; Keller, S. ; Mohanchandra, K.P. ; Carman, Gregory P.
Author_Institution :
Dept. of Mech. & Aerosp. Eng., Univ. of California, Los Angeles, Los Angeles, CA, USA
Abstract :
The temperature dependence of the magneto-dielectric (MD) response in polycrystalline γ-Fe2O3 nanoparticulates embedded in an epoxy resin has been experimentally investigated. A maximum in the MD coefficient (~9%) occurs at ~200 K, which is well below its Curie point (Tc ~ 948 K) and blocking temperature (TB = 310 K). The law of approach to saturation technique was used to measure the effective magnetic anisotropy KE over a broad temperature range. A maximum in the effective magnetic anisotropy appears at ~200 K. The correlation between the maxima in K E and MD suggests that magnetic anisotropy may play a role in designing improved magneto-dielectric coupling in single-phase magnetic materials at the nanoscale.
Keywords :
ferroelectric Curie temperature; filled polymers; iron compounds; magnetic anisotropy; magnetic particles; magnetoelectronics; nanocomposites; nanomagnetics; nanoparticles; resins; Curie point; Fe2O3; blocking temperature; epoxy resin; magnetic anisotropy; magneto-dielectric anisotropy; magneto-dielectric coupling; magneto-dielectric response; nanocomposite; polycrystalline nanoparticulates; saturation technique; single-phase magnetic materials; temperature dependence; Anisotropic magnetoresistance; Nanoparticles; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature measurement; γ-Fe$_{2}$O $_{3}$ nanocomposite; Magneto-electronics; law of approach to saturation; magnetic anisotropy; magneto-dielectric;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2013.2276771
