Yttrium iron garnet (YIG, Y3Fe5 O 12) films were synthesized from a polymeric precursor and they were deposited by spin coating onto amorphous silica substrates; where the films were annealed at T a = 450, 600, 700, 800, and 900 ∘C under air. Vibrational and magnetic properties of YIG films were followed by means of Raman spectroscopy, vibrant sample magnetometry (VSM), and ferromagnetic resonance (FMR), respectively. X-ray diffraction and Raman spectroscopy indicated that the YIG films are crystalline after annealing at T a ≥ 800 ∘C, but they are amorphous below T a. The amorphous films have a broad Raman band to 670 cm−1, due to higher states in the phonon state density of YIG, suggesting the existence of a short order around tetrahedral Fe3+ ions. Magnetic hysteresis measurements are indicative of a superparamagnetic behavior in amorphous YIG films and with a soft magnetic behavior in the crystalline ones. The deconvolution in FMR spectra shows that the amorphous precursor films have two different absorption modes corresponding to different sites for Fe3+ ions: the first is associated with magnetic local ordering around tetrahedral Fe3+ centers corresponding with superexchange interactions J aa in tetrahedral sites, while the other absorption is associated with an amorphous matrix in the paramagnetic state. Finally, FMR spectra in crystalline films show the presence of two different sites for Fe3+ ions, and that they are associated with magnetic local ordering around tetrahedral and octahedral Fe3+ centers.
Journal of Superconductivity and Novel Magnetism – Springer Journals
Published: Mar 17, 2017
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera