Effect of annealing on the magnetic properties of Y3Fe5O12 and Y2.95La0.05Fe4.7Ga0.3O12 films

Yur’ev, S. A.; Yushchuk, S. І.

doi:10.1134/s0020168513020246

Cited by 4 publications

(1 citation statement)

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“…It is also well known that the coercivity of magnetic material is controlled by the magnetic anisotropy constants, such as the magneto-crystalline, magneto-elastic, or shape anisotropies. 29 Consequently, as oxygen annealing is expected to suppress the anisotropy within the system, lower coercivity values can be expected. The weak ferromagnetic but slightly different behaviour in BCFO15 and BCFO25 samples annealed in air and oxygen is shown in Figures 4(a)-4(d).…”

Section: Resultsmentioning

confidence: 99%

Effect of oxygen annealing on the multiferroic properties of Ca2+ doped BiFeO3 nanoceramics

Tirupathi

Mandal

Chandra

2014

Journal of Applied Physics

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The high leakage current in divalent ion doped BiFeO 3 systems is limiting their large scale application. It is clearly shown that the methodology of oxygen annealing will prove to be an effective procedure for suppressing the detrimental consequences that originate from the oxygen vacancies. The samples annealed under oxygen also show different particle morphologies and packing density that can help in tuning the relevant physical properties, viz., magnetic, ferroelectric, and magnetoelectric. The difference in magnetic behaviour in samples annealed in air and oxygen can be explained in terms of the modification in the Fe-O-Fe bonds, domain wall pinning centres, and crystal anisotropy. Another important observation is the stabilization of a dielectric anomaly near the magnetic transition temperature. This observation can make this multiferroic system very interesting for application in sensors where the change in the magnetic parameters can be observed by monitoring the electrical parameters. Detailed analysis of the dielectric and impedance curves indicate towards the presence of non-Debye type processes in samples obtained by annealing in air or oxygen. From the calculated activation energy values, the vacancy related relaxation mechanism is predominant in air annealed samples, while the oxygen annealed samples show the presence of two type of relaxation processes, viz., electron hopping mechanism stabilizes at low temperature while, at higher temperatures, the process associated with the diffusion of doubly ionized oxygen ions predominates. The ac-conductivity data suggests that the correlated barrier tunnelling mechanism, where single electron or two electrons hopping through neighbouring lattice sites leads to ac-conduction. V C 2014 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 99%