Enhancement of ferromagnetic properties in BiFeO3 polycrystalline ceramic by La doping

Lin, Yucong; Jiang, Qinghui; Wang, Yao; Nan, Ce‐Wen; Chen, Lin; Yu, Jian

doi:10.1063/1.2732182

Cited by 214 publications

(124 citation statements)

References 20 publications

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“…The magnetic moment of Bi 0.7 La 0.3 FeO 3 deviates from this trend and decreases to ϳ0.027 emu/ g. Similar ferromagnetic moment enhancement has been observed previously. 7 We believe that La doping in Bi 1−x La x FeO 3 destroys the cycloid spin structure which hinders the observation of any linear magnetoelectric effect in pure BiFeO 3 , releases the latent magnetization locked within this structure, and enhances the magnetic moment. To compare the intensity of the improvement, the 10% La doping does not improve the magnetic moment too much, while a drastic improvement is found with 20% La doping.…”

Section: Resultsmentioning

confidence: 99%

“…For example, La substitution for Bi can improve the magnetic moment in BiFeO 3 . 7 Yet, our knowledge of the doping effect of La in BiFeO 3 is very limited and deficient. A systematic study of the La doping effect on the structure and on the ferroelectric, dielectric, and magnetic properties of BiFeO 3 could be of some value and has not been previously conducted.…”

Section: Introductionmentioning

confidence: 99%

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Structure, ferroelectric properties, and magnetic properties of the La-doped bismuth ferrite

Cheng

Wang

et al. 2008

Journal of Applied Physics

292

116

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Bi 1-x La x FeO 3 ceramics with x=0, 0.1, 0.2, and 0.3 have been synthesized by solid state reaction, starting from metal oxides. A series of structure transformations is found to depend upon the doping level. Below 10% La doping, Bi 1-x La x FeO 3 maintains the rhombohedral structure of BiFeO 3 . However, for Bi 0.8 La 0.2 FeO 3 and Bi 0.7 La 0.3 FeO 3 , the structures change to the orthorhombic and tetragonal, respectively. La doping significantly reduces electric leakage and leads to successful observation of electrical polarization hysteresis loops. Doping with La also enhances the ferromagnetic moment, due to the broken cycloid spin structure caused by the changes in the crystalline structure. KeywordsStructure, ferroelectric, properties, magnetic, properties, doped, bismuth, ferrite Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsCheng, Z, Li, A, Wang, P, Dou, S, Ozawa, K, Kimura, H, Zhang, S & Shrout, T (2008) , the structures change to the orthorhombic and tetragonal, respectively. La doping significantly reduces electric leakage and leads to successful observation of electrical polarization hysteresis loops. Doping with La also enhances the ferromagnetic moment, due to the broken cycloid spin structure caused by the changes in the crystalline structure.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure, ferroelectric properties, and magnetic properties of the La-doped bismuth ferrite

Cheng

Wang

et al. 2008

Journal of Applied Physics

292

116

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“…The control of magneto-electric properties is in significant interest for applications in advanced multifunctional devices such as magnetic storage media and spintronics [3,4]. During past decade, some oxide materials have been mentioned as multiferroics follow as BaTi2O4, BiFeO3, BiMnO3, CuO, LuFe2O4, YMnO3 and so on [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Reinforced magnetic properties of Ni-doped BiFeO3 ceramic

Hwang

Yoo

Lee

et al. 2016

Journal of the Korean Physical Society

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Multiferroic materials attract considerable interest because of the wide range of potential applications such as spintronic devices, data storage and sensors. As a strong candidate for the applications among the limited list of single-phase multiferroic materials, BiFeO3 (BFO) is a quite attractive material due to its multiferroic properties at room temperature (RT). However, BFO is widely known to have large leakage current and small spontaneous polarization due to the existence of crystalline defects such as oxygen vacancies. Furthermore, the magnetic moment of pure BFO is very weak owing to its antiferromagnetic nature. In this paper, the effects of Ni 2+ substitution on the magnetic properties of bulk BFO have been investigated. BFO, and BiFe0.99Ni0.01O3, BiFe0.98Ni0.02O3and BiFe0.97Ni0.03O3 (BFNO: Ni-doped BFO) ceramics were prepared by solid-state reaction and rapid sintering, and analyzed by structural and magnetic-property measurements. The leakage current density was measured at RT by using a standard ferroelectric tester. All the Ni-doped BFO exhibit the similar rhombohedral perovskite structure (R3c) to that of BFO. The magnetic properties of Ni-doped BFO are much enhanced with respect to BFO prepared at the same conditions, since the enhanced ferromagnetic interaction is caused by the Fe/Ni coupling.

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“…Addition of La 3+ significantly reduces the volatility of bismuth oxide which leads to the stability of oxygen ions in the lattice and enhance magnetic properties by destroying the spin cycloid structure which otherwise act as a hurdle in the observation of linear magneto electric effect in pure BFO. 12,13 Addition of divalent ions leads to the weak ferromagnetism as reported by Khomchenko et al 5 by the creation of oxygen vacancy or Fe 4+ to compensate the charges. Strong correlation between the ionic radii and magnetization is found in all sintered samples.…”

Section: Introductionmentioning

confidence: 98%

Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy

et al. 2014

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Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics were studied using x-ray, neutron diffraction and magnetization techniques. All the samples crystallized in rhombohedral structure with space group R3c. The compounds exhibit antiferromagnetic (AFM) ordering at 300 K and no evidence of further structural or magnetic transition was observed on lowering of temperature below it. The magnetic structure of these substituted compounds are found to be collinear G-type AFM structure as against the non collinear incommensurate magnetic structure reported in the case of parent compound. The moments on Fe at 6 K are aligned along the a-axis in the case of Ca-doped sample. With increase in the ionic radii of dopant, the moments are found to be aligned in the ac plane and the angle of tilt away from the a-axis increases. The observed change in the magnetic structure with substitution is attributed to the intrinsic structural distortion as evidenced by the change in the bond angle (Fe-O-Fe) and bond distances (Bi-O, Fe-O). It has been found that heterovalent substitution A2+ results in the formation of oxygen vacancies in the parent lattices as the possibility of Fe4+ ruled out by Mössbauer spectra recorded at room temperature. Higher value of remnant magnetization (0.4187 emu/g) and coercivity (4.7554kOe) is observed in Bi0.8Ba0.2FeO3 sample in comparison to other substituted samples revealing a strong correlation between ionic radii and magnetization.

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Enhancement of ferromagnetic properties in BiFeO3 polycrystalline ceramic by La doping

Cited by 214 publications

References 20 publications

Structure, ferroelectric properties, and magnetic properties of the La-doped bismuth ferrite

Structure, ferroelectric properties, and magnetic properties of the La-doped bismuth ferrite

Reinforced magnetic properties of Ni-doped BiFeO3 ceramic

Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy

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