Abstract
The growth- and frequency-dependent microwave studies on ~ 250 nm thick Y₃Fe₅O₁₂ [yttrium iron garnet (YIG)] films deposited on Gd₃Ga₅O₁₂ (111) (gadolinium gallium garnet) substrates by RF magnetron sputtering has been reported. After the deposition, the thin films were ex-situ annealed in air at 700 °C for different time intervals (2, 4, 6, and 10 h) and a pure YIG phase with preferred (111) orientation was formed. Effective saturation magnetization (4π Meff) has been estimated from ferromagnetic resonance (FMR) data using Kittel's equations. A negative uniaxial magnetic anisotropy has been observed which decreased with the increase in annealing time. The FMR linewidth (Δ H) for the 10 h annealed film was found to be nearly half of the one annealed for 2 h. The 10 h annealed film showed a Δ H value which lies between 30 and 50 Oe over a wide frequency range (2-18 GHz). This improvement in the microwave properties as a result of annealing is attributed to the reduction of defects and relaxation of stress.
| Original language | English |
|---|---|
| Article number | 2801205 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 54 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2018 |
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Effect of Annealing on the Structural and FMR Properties of Epitaxial YIG Thin Films Grown by RF Magnetron Sputtering. / Bhoi, Biswanath; Venkataramani, Narayanan; Aiyar, Ramnath P.R.C.; Prasad, Shiva; Kostylev, Mikhail.
In: IEEE Transactions on Magnetics, Vol. 54, No. 11, 2801205, 11.2018.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effect of Annealing on the Structural and FMR Properties of Epitaxial YIG Thin Films Grown by RF Magnetron Sputtering
AU - Bhoi, Biswanath
AU - Venkataramani, Narayanan
AU - Aiyar, Ramnath P.R.C.
AU - Prasad, Shiva
AU - Kostylev, Mikhail
PY - 2018/11
Y1 - 2018/11
N2 - The growth- and frequency-dependent microwave studies on ~ 250 nm thick Y₃Fe₅O₁₂ [yttrium iron garnet (YIG)] films deposited on Gd₃Ga₅O₁₂ (111) (gadolinium gallium garnet) substrates by RF magnetron sputtering has been reported. After the deposition, the thin films were ex-situ annealed in air at 700 °C for different time intervals (2, 4, 6, and 10 h) and a pure YIG phase with preferred (111) orientation was formed. Effective saturation magnetization (4π Meff) has been estimated from ferromagnetic resonance (FMR) data using Kittel's equations. A negative uniaxial magnetic anisotropy has been observed which decreased with the increase in annealing time. The FMR linewidth (Δ H) for the 10 h annealed film was found to be nearly half of the one annealed for 2 h. The 10 h annealed film showed a Δ H value which lies between 30 and 50 Oe over a wide frequency range (2-18 GHz). This improvement in the microwave properties as a result of annealing is attributed to the reduction of defects and relaxation of stress.
AB - The growth- and frequency-dependent microwave studies on ~ 250 nm thick Y₃Fe₅O₁₂ [yttrium iron garnet (YIG)] films deposited on Gd₃Ga₅O₁₂ (111) (gadolinium gallium garnet) substrates by RF magnetron sputtering has been reported. After the deposition, the thin films were ex-situ annealed in air at 700 °C for different time intervals (2, 4, 6, and 10 h) and a pure YIG phase with preferred (111) orientation was formed. Effective saturation magnetization (4π Meff) has been estimated from ferromagnetic resonance (FMR) data using Kittel's equations. A negative uniaxial magnetic anisotropy has been observed which decreased with the increase in annealing time. The FMR linewidth (Δ H) for the 10 h annealed film was found to be nearly half of the one annealed for 2 h. The 10 h annealed film showed a Δ H value which lies between 30 and 50 Oe over a wide frequency range (2-18 GHz). This improvement in the microwave properties as a result of annealing is attributed to the reduction of defects and relaxation of stress.
KW - Annealing
KW - Ferromagnetic resonance (FMR)
KW - linewidth
KW - Magnetic resonance
KW - Magnetomechanical effects
KW - microwave materials
KW - Perpendicular magnetic anisotropy
KW - Radio frequency
KW - Substrates
KW - yttrium iron garnet (YIG)
UR - http://www.scopus.com/inward/record.url?scp=85049072984&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2018.2842260
DO - 10.1109/TMAG.2018.2842260
M3 - Article
VL - 54
JO - Institute of Electrical and Electronics Engineers Transactions on Magnetics
JF - Institute of Electrical and Electronics Engineers Transactions on Magnetics
SN - 0018-9464
IS - 11
M1 - 2801205
ER -