Au quantum dots engineered room temperature crystallization and magnetic anisotropy in CoFe₂O₄ thin films

Abstract

For the first time, this work presents a novel room temperature time-effective concept to manipulate the crystallization kinetics and magnetic responses of thin films grown on amorphous substrates.

Combined Bottom-Up and Top-Down Approach for Highly Ordered One-Dimensional Composite Nanostructures for Spin Insulatronics

“…In Table 1 , we summarize the saturation magnetization and coercivity values of our composite nanowire and thin film samples, as well as compare them with corresponding reported values in CFO thin films. Considering the 50% phase fraction of CFO in our composite samples, the saturation magnetization values match well with the reported values of M S in polycrystalline CFO thin films, 44 , 45 though they are smaller than the value of M S for a single-crystal-like CFO thin film. 46 The room-temperature coercive field values of the composite samples are smaller than that of CFO thin films because of the effect of the 50% phase fraction of antiferromagnetic LFO in our samples.…”

“…The saturation magnetization ( M S ) and coercive fields ( H C ) of CFO thin films have been observed to increase with an increase in the degree of crystallization, with M S = 110 emu/cm 3 and out-of-plane H C = 230 Oe in amorphous CFO film to M S = 262 emu/cm 3 and out-of-plane H C = 4150 Oe in crystallized CFO thin film. 44 Apart from the degree of crystallization, the crystal orientation also has a strong effect on the coercive fields, with a reported large out-of-plane coercivity of 11.3 kOe in (311)-preferred randomly oriented CFO thin film. 45 Recently, a very high out-of-plane coercive field of 14.1 kOe and high saturation magnetization of 475 emu/cm 3 has been reported in a preferentially oriented single-crystal-like textured thin film on an amorphous substrate grown using an innovative self-bilayer method.…”

Eco-Friendly Synthesis, Crystal Chemistry, and Magnetic Properties of Manganese-Substituted CoFe2O4 Nanoparticles

“…16 Specifically, inverse spinel CFO is one of the most industrially important members of the magnetic ferrite class for device applications. 17 CoFe 2 O 4 is the preferred choice for large data storage and usage in physical (stress) sensors because of higher coercive field and magnetocrystalline anisotropy. 17 , 18 On the other hand, CFO and MnFe 2 O 4 are becoming important for biomedical applications (magnetic resonance imaging, biomolecule detection, and magnetic hyperthermia) due to their increased degree of magnetization compared to other nanoferrites.…”

The impact of cation distribution on the structural and magnetic properties of nonstoichiometric Co0.5Ni0.5+xFe2−xO4 nanoferrites

“…Nickel ferrite is distinguished by its moderate magnetization, low coercivity, high resistivity, and is thus classified as soft magnetic and low electrical-loss material [24,25] and thus used as gas sensors, catalysts, and ferrofluid. On the other hand, hard ferrimagnetic cobalt ferrite is characterized by its relatively high magnetization, lower resistivity, excellent chemical stability, mechanical hardness, and high coercivity, and thus suitable for high-density magnetic recording applications [26]. In fact, the presence of Co 2+ ions in the octahedral sites is the origin of the distinct magnetocrystalline anisotropy for CoFe2O4 [27].…”