High magnetization and the Faraday effect for ferrimagnetic zinc ferrite thin film

Abstract

The magnetization and Faraday effect in the wavelength range of 350–850 nm have been measured for zinc ferrite thin film prepared by the sputtering method. X-ray diffraction analysis indicates that the thin film is single-phase ZnFe2O4, whose crystallite size evaluated from Scherrer’s equation is 10 nm or so. The thin film is extremely transparent for wavelengths longer than about 600 nm, and exhibits high magnetization, i.e., 32 emu g−1, at 1 T even at room temperature. The absolute value of the Faraday rotation angle is 1.0 × 104 deg cm−1 at a wavelength of 470 nm when an external magnetic field of 5 kOe is applied.

Magnetic properties of disordered oxides with iron and manganese ions

“…This phenomenon arises from the fact that the superexchange interaction between Fe 3+ in tetrahedral site and Fe 3+ in octahedral site is dominant in the disordered ZnFe 2 O 4 thin film. The disordered ZnFe 2 O 4 thin film also shows rather large Faraday effect at a short wavelength range like 470 nm [8]. In this study, we briefly discuss the magnetic properties of disordered ZnFe 2 O 4 thin film as well.…”

“…A disordered ZnFe 2 O 4 thin film in which Fe 3+ ions are randomly distributed in tetrahedral as well as octahedral sites exhibits rather high spin-freezing temperature, below which random freezing of magnetic moments appears [6,7]. In addition, it should be noted that the disordered ZnFe 2 O 4 thin film exhibits rather high magnetization even at room temperature although the stable phase of ZnFe 2 O 4 , the structure of which is normal spinel-type, is antiferromagnetic with the Néel temperature of 10 K [8]. This phenomenon arises from the fact that the superexchange interaction between Fe 3+ in tetrahedral site and Fe 3+ in octahedral site is dominant in the disordered ZnFe 2 O 4 thin film.…”

不規則系酸化物における光学的２次非線形性と磁気秩序

“…Furthermore, the ZnFe 2 O 4 thin film exhibits large Faraday effect at a wavelength of 450 to 500 nm. 58 The maximum Faraday rotation angle is comparable to those for Fe 3 O 4 , YIG, barium ferrite, and so forth. These curious magnetic and magnetooptical properties of ZnFe 2 O 4 thin film prepared by the sputtering method are described in the present paper.…”

Magnetic properties of B and AB-spinels Zn1−xMxFe2O4 (M=Ni, Mg) materials

“…To determine J 1 (x) and J 2 (x) in the whole range concentration for the Zn 1−x Mg x Fe 2 O 4 and Zn 1−x Ni x Fe 2 O 4 systems, we have used the experimental values of T N and  p obtained by magnetic measurement [10][11][12][13]. We have deduced the values of exchange integrals J 1 (x) and J 2 (x) for the Zn 1−x Mg x Fe 2 O 4 and for the Zn 1−x Ni x Fe 2 O 4 systems in the pure case.…”