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Giant dielectric and magnetoelectric responses in insulating nanogranular films at room temperature.

Kobayashi N, Masumoto H, Takahashi S, Maekawa S - Nat Commun (2014)

Bottom Line: In these films, Fe-Co alloy-based nanometer-sized magnetic granules are dispersed in a Mg-fluoride-based insulator matrix.Insulating nanogranular films are a new class of multifunctional materials.A possible application of such insulating nanogranular materials with giant response is in the construction of a tunable device, in which impedance components such as capacitance and inductance are tunable at room temperature.

View Article: PubMed Central - PubMed

Affiliation: Research Institute for Electromagnetic Materials, 2-1-1,Yagiyama-minami, Taihaku-ku, Sendai 982-0807, Japan.

ABSTRACT
The electric and magnetic properties of matter are of great interest for materials science and their use in electronic applications. Large dielectric and magnetoelectric responses of materials at room temperature are a great advantage for electromagnetic device applications. Here we present a study of FeCo-MgF nanogranular films exhibiting giant dielectric and magnetoelectric responses at room temperature; with dielectric constant ε'=490 and magnetoelectric response Δε'/ε'0=3%. In these films, Fe-Co alloy-based nanometer-sized magnetic granules are dispersed in a Mg-fluoride-based insulator matrix. Insulating nanogranular films are a new class of multifunctional materials. The giant responses are caused by spin-dependent charge oscillation between magnetic granules via quantum-mechanical tunnelling. A possible application of such insulating nanogranular materials with giant response is in the construction of a tunable device, in which impedance components such as capacitance and inductance are tunable at room temperature.

No MeSH data available.


Related in: MedlinePlus

Magnetization dependence of the magnetoelectric effect of Fe9Co8Mg26F57 nanogranular film.Magnetodielectric ratio Δε′/ε′0 versus applied magnetic field H in the Fe9Co8Mg26F57 (Fe+Co=17at.%) film. The solid blue curve represents the values of (M/M1,200)2 as a function of magnetic field H, where the magnetization curve in Fig. 3 is used and M1,200 is the magnetization at the maximum measured magnetic field of 1,200 kA m−1. The DC resistivity of the film is beyond 1010 μΩm.
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f5: Magnetization dependence of the magnetoelectric effect of Fe9Co8Mg26F57 nanogranular film.Magnetodielectric ratio Δε′/ε′0 versus applied magnetic field H in the Fe9Co8Mg26F57 (Fe+Co=17at.%) film. The solid blue curve represents the values of (M/M1,200)2 as a function of magnetic field H, where the magnetization curve in Fig. 3 is used and M1,200 is the magnetization at the maximum measured magnetic field of 1,200 kA m−1. The DC resistivity of the film is beyond 1010 μΩm.

Mentions: Figure 4 represents the change in the dielectric constant (Δε′) of Fe9Co8Mg26F57 (Fe+Co=17 at.%) film at applied magnetic field 800 kA m−1. The dielectric constant increases by the application of magnetic field over the whole frequency range, indicating a positive magnetoelectric effect. The ratio of Δε′ and the dielectric constant in zero magnetic field ε′0 (Δε′/ε′0) is plotted as a function of H for Fe9Co8Mg26F57 film at 10 kHz in Fig. 5. This electromagnetic effect has been observed at room temperature.


Giant dielectric and magnetoelectric responses in insulating nanogranular films at room temperature.

Kobayashi N, Masumoto H, Takahashi S, Maekawa S - Nat Commun (2014)

Magnetization dependence of the magnetoelectric effect of Fe9Co8Mg26F57 nanogranular film.Magnetodielectric ratio Δε′/ε′0 versus applied magnetic field H in the Fe9Co8Mg26F57 (Fe+Co=17at.%) film. The solid blue curve represents the values of (M/M1,200)2 as a function of magnetic field H, where the magnetization curve in Fig. 3 is used and M1,200 is the magnetization at the maximum measured magnetic field of 1,200 kA m−1. The DC resistivity of the film is beyond 1010 μΩm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109019&req=5

f5: Magnetization dependence of the magnetoelectric effect of Fe9Co8Mg26F57 nanogranular film.Magnetodielectric ratio Δε′/ε′0 versus applied magnetic field H in the Fe9Co8Mg26F57 (Fe+Co=17at.%) film. The solid blue curve represents the values of (M/M1,200)2 as a function of magnetic field H, where the magnetization curve in Fig. 3 is used and M1,200 is the magnetization at the maximum measured magnetic field of 1,200 kA m−1. The DC resistivity of the film is beyond 1010 μΩm.
Mentions: Figure 4 represents the change in the dielectric constant (Δε′) of Fe9Co8Mg26F57 (Fe+Co=17 at.%) film at applied magnetic field 800 kA m−1. The dielectric constant increases by the application of magnetic field over the whole frequency range, indicating a positive magnetoelectric effect. The ratio of Δε′ and the dielectric constant in zero magnetic field ε′0 (Δε′/ε′0) is plotted as a function of H for Fe9Co8Mg26F57 film at 10 kHz in Fig. 5. This electromagnetic effect has been observed at room temperature.

Bottom Line: In these films, Fe-Co alloy-based nanometer-sized magnetic granules are dispersed in a Mg-fluoride-based insulator matrix.Insulating nanogranular films are a new class of multifunctional materials.A possible application of such insulating nanogranular materials with giant response is in the construction of a tunable device, in which impedance components such as capacitance and inductance are tunable at room temperature.

View Article: PubMed Central - PubMed

Affiliation: Research Institute for Electromagnetic Materials, 2-1-1,Yagiyama-minami, Taihaku-ku, Sendai 982-0807, Japan.

ABSTRACT
The electric and magnetic properties of matter are of great interest for materials science and their use in electronic applications. Large dielectric and magnetoelectric responses of materials at room temperature are a great advantage for electromagnetic device applications. Here we present a study of FeCo-MgF nanogranular films exhibiting giant dielectric and magnetoelectric responses at room temperature; with dielectric constant ε'=490 and magnetoelectric response Δε'/ε'0=3%. In these films, Fe-Co alloy-based nanometer-sized magnetic granules are dispersed in a Mg-fluoride-based insulator matrix. Insulating nanogranular films are a new class of multifunctional materials. The giant responses are caused by spin-dependent charge oscillation between magnetic granules via quantum-mechanical tunnelling. A possible application of such insulating nanogranular materials with giant response is in the construction of a tunable device, in which impedance components such as capacitance and inductance are tunable at room temperature.

No MeSH data available.


Related in: MedlinePlus