Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

Sarath Arackal; Kouhei Nozawa; Ralandinliu Kahmei; Ton That Loi; Shin Yabukami; S. A. Shivashankar; Masahiro Yamaguchi; Navakanta Bhat; Ranajit Sai

doi:10.1063/5.0102965

Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

Sarath Arackal
, Kouhei Nozawa
, Ralandinliu Kahmei
, Ton That Loi
, Shin Yabukami
, S. A. Shivashankar
, Masahiro Yamaguchi
, Navakanta Bhat
, Ranajit Sai

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate the frequency dispersion of complex permeability in the GHz range in superparamagnetic nickel-zinc ferrite thin films with different Ni/Zn ratios using a microstrip probe. The films, comprising crystallites as small as 3 nm and deposited by a microwave-irradiation-Assisted solvothermal method, exhibit the coexistence of two resonance characteristics-A ferromagnetic resonance peak (f r) at ∼2 GHz and a superparamagnetic resonance peak (f b) above 20 GHz, breaching Snoek's limit. The high value of f r is attributed to the high surface anisotropy and far-from-equilibrium distribution of cations in the lattice, while f b is attributed to the thermally driven superparamagnetic relaxation of ferrite nanocrystallites in the thin films. This work demonstrates the feasibility of employing superparamagnetic ferrite thin films so deposited as excellent CMOS-integrable magnetic components for high-speed and high-frequency electromagnetic device applications.

Original language	English
Article number	062402
Journal	Applied Physics Letters
Volume	121
Issue number	6
DOIs	https://doi.org/10.1063/5.0102965
Publication status	Published - 8 Aug 2022
Externally published	Yes

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10.1063/5.0102965

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title = "Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite",

abstract = "We investigate the frequency dispersion of complex permeability in the GHz range in superparamagnetic nickel-zinc ferrite thin films with different Ni/Zn ratios using a microstrip probe. The films, comprising crystallites as small as 3 nm and deposited by a microwave-irradiation-Assisted solvothermal method, exhibit the coexistence of two resonance characteristics-A ferromagnetic resonance peak (f r) at ∼2 GHz and a superparamagnetic resonance peak (f b) above 20 GHz, breaching Snoek's limit. The high value of f r is attributed to the high surface anisotropy and far-from-equilibrium distribution of cations in the lattice, while f b is attributed to the thermally driven superparamagnetic relaxation of ferrite nanocrystallites in the thin films. This work demonstrates the feasibility of employing superparamagnetic ferrite thin films so deposited as excellent CMOS-integrable magnetic components for high-speed and high-frequency electromagnetic device applications.",

author = "Sarath Arackal and Kouhei Nozawa and Ralandinliu Kahmei and Loi, \{Ton That\} and Shin Yabukami and Shivashankar, \{S. A.\} and Masahiro Yamaguchi and Navakanta Bhat and Ranajit Sai",

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year = "2022",

month = aug,

day = "8",

doi = "10.1063/5.0102965",

language = "English",

volume = "121",

journal = "Applied Physics Letters",

issn = "0003-6951",

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TY - JOUR

T1 - Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

AU - Arackal, Sarath

AU - Nozawa, Kouhei

AU - Kahmei, Ralandinliu

AU - Loi, Ton That

AU - Yabukami, Shin

AU - Shivashankar, S. A.

AU - Yamaguchi, Masahiro

AU - Bhat, Navakanta

AU - Sai, Ranajit

PY - 2022/8/8

Y1 - 2022/8/8

N2 - We investigate the frequency dispersion of complex permeability in the GHz range in superparamagnetic nickel-zinc ferrite thin films with different Ni/Zn ratios using a microstrip probe. The films, comprising crystallites as small as 3 nm and deposited by a microwave-irradiation-Assisted solvothermal method, exhibit the coexistence of two resonance characteristics-A ferromagnetic resonance peak (f r) at ∼2 GHz and a superparamagnetic resonance peak (f b) above 20 GHz, breaching Snoek's limit. The high value of f r is attributed to the high surface anisotropy and far-from-equilibrium distribution of cations in the lattice, while f b is attributed to the thermally driven superparamagnetic relaxation of ferrite nanocrystallites in the thin films. This work demonstrates the feasibility of employing superparamagnetic ferrite thin films so deposited as excellent CMOS-integrable magnetic components for high-speed and high-frequency electromagnetic device applications.

AB - We investigate the frequency dispersion of complex permeability in the GHz range in superparamagnetic nickel-zinc ferrite thin films with different Ni/Zn ratios using a microstrip probe. The films, comprising crystallites as small as 3 nm and deposited by a microwave-irradiation-Assisted solvothermal method, exhibit the coexistence of two resonance characteristics-A ferromagnetic resonance peak (f r) at ∼2 GHz and a superparamagnetic resonance peak (f b) above 20 GHz, breaching Snoek's limit. The high value of f r is attributed to the high surface anisotropy and far-from-equilibrium distribution of cations in the lattice, while f b is attributed to the thermally driven superparamagnetic relaxation of ferrite nanocrystallites in the thin films. This work demonstrates the feasibility of employing superparamagnetic ferrite thin films so deposited as excellent CMOS-integrable magnetic components for high-speed and high-frequency electromagnetic device applications.

UR - https://www.scopus.com/pages/publications/85136280635

U2 - 10.1063/5.0102965

DO - 10.1063/5.0102965

M3 - Article

AN - SCOPUS:85136280635

SN - 0003-6951

VL - 121

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 6

M1 - 062402

ER -

Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

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