Effect of quenching on the magnetic properties of Mg-ferrite thin films

Abstract

We have investigated the microstructural and magnetic properties of the post annealed slow cooled and quenched Mg-ferrite thin films. The microstructural properties of these films were studied through XRD, TEM and SEM. The magnetic properties were studied using VSM at 300K and 10K. The quenched film showed ∼1.66 times higher magnetization at room temperature (RT) compared to the bulk and the slow cooled film (4πMS of bulk∼1880 Gauss at RT) though the crystal phase, grain size and thickness of both the films were similar. The change in the cation distribution is the plausible origin of large magnetization observed in the quenched (rapid cooled) film.

Effect of interface quality on spin Hall magnetoresistance in Pt/MgFe2O4 bilayers

“…−1 (1.36 × 10 5 A m −1 ) for 50 mTorr and 1.85 μ B f.u. −1 (2.26 × 10 5 A m −1 ) for 100 mTorr, similar to the reported values; 33,34) by applying the out-of-plane magnetic field (not shown), we confirmed that both films exhibit the in-plane easy axis of magnetization, providing the effective perpendicular magnetic anisotropy K u eff = −4.20 × 10 4 J m −3 for 50 mTorr and K u eff = −1.83 × 10 5 J m −3 for 100 mTorr. The smaller M s for the 50 mTorr film is explained by the above-mentioned larger inversion parameter, since both the M s and the lattice constant are reduced as the inversion parameter increases.…”

“…The smaller M s for the 50 mTorr film is explained by the above-mentioned larger inversion parameter, since both the M s and the lattice constant are reduced as the inversion parameter increases. 32,34) The normalized magnetization curves in the inset indicate that the saturation field is smaller for 50 mTorr film. While we speculate that the different saturation field is strongly connected with the inversion parameter as well through the magnetic anisotropy, it has been unclear how the inversion parameter correlates with the magnetic anisotropy in the spinel ferrites; further experimental study is required to clarify this.…”

Study of the Effect of Quenching on Microstructural and Magnetic Properties of Cu-Doped Mg-Ferrite

“…e cation distribution of ferrite is influenced by many factors such as the synthesis method, cations substitution, and postpreparation heat treatments [7][8][9]. Moreover, the cooling rate from high temperatures can change the cation distribution of the ferrites, leading to modifying the room temperature phase distribution, microstructure, and magnetic properties [10][11][12][13][14][15].…”

Zero field cooled exchange bias effect in nano-crystalline Mg-ferrite thin film

“…14 In Mg-ferrite bulk sample, a (x = ~ 0.89) faction of Fe 3+ ions occupy the A sites while other (2-x) in the B sites and this leads to the ferrimagnetic ordering in it. 14,15 However, it is to be noted that these single phase bulk spinel ferrites (MFe2O4, M = Mg, Mn, Co, Ni) do not show exchange bias effect. Though, there are few reports on conventional exchange bias effect in thin films of some ferrites.…”