Ferromagnetic Resonance of Micro- and Nano-sized Hexagonal Ferrite Powders at Millimeter Waves

Journal Article · Wed Feb 22 00:00:00 EST 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3671793· OSTI ID:1035724

Korolev, Konstantin A; McCloy, John S; Afsar, Mohammed N

Complex magnetic permeability and dielectric permittivity of micro- and nano-sized powdered barium (BaFe{sub 12}O{sub 19}) and strontium (SrFe{sub 12}O{sub 19}) hexaferrites have been studied in a broadband millimeter wave frequency range (30-120 GHz). Transmittance measurements have been performed using a free space quasi-optical millimeter wave spectrometer, equipped with a set of high power backward wave oscillators. Real and imaginary parts of dielectric permittivity for both types of micro- and nanoferrites have been calculated using analysis of recorded high precision transmittance spectra. Frequency dependences of the magnetic permeability have been obtained from Schloemann's equation for partially magnetized ferrites. These materials show promise as tunable millimeter wave absorber, based on their size-dependent absorption.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1035724
• Report Number(s): PNNL-SA-82678; JAPIAU; 400403909; TRN: US201205%%266
• Journal Information: Journal of Applied Physics, Vol. 111, Issue 7; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ACCURACY
BARIUM
BARIUM COMPOUNDS
CERAMICS
DIELECTRIC MATERIALS
FERRITE
FERRITES
FERROMAGNETIC RESONANCE
FREQUENCY DEPENDENCE
FREQUENCY RANGE
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
OSCILLATORS
PERMITTIVITY
SPECTRA
STRONTIUM
STRONTIUM COMPOUNDS
millimeter wave
ferromagnetic resonance