Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields
TLDR
In this paper, the exchange bias effect decreases with increasing temperature up to TC and vanishes above this temperature with disappearance of the antiferromagnetic-ferromagnetic (FM) spontaneous phase segregated state of this compound.Abstract:
Exchange bias (EB) phenomena have been observed in Nd2/3Ca1/3MnO3 colossal magnetoresistance perovskite below the Curie temperature TC ∼ 70 K and attributed to an antiferromagnetic–ferromagnetic (FM) spontaneous phase segregated state of this compound. Field cooled magnetic hysteresis loops exhibit shifts toward negative direction of the magnetic field axis. The values of exchange field HEB and coercivity HC are found to be strongly dependent of temperature and strength of the cooling magnetic field Hcool. These effects are attributed to evolution of the FM phase content and a size of FM clusters. A contribution to the total magnetization of the system due to the FM phase has been evaluated. The exchange bias effect decreases with increasing temperature up to TC and vanishes above this temperature with disappearance of FM phase. Relaxation of a non-equilibrium magnetic state of the compound manifests itself through a training effect also observed while studying EB in Nd2/3Ca1/3MnO3.read more
Citations
More filters
Journal ArticleDOI
Synthesis of Ferromagnetic Fe0.6 Mn0.4 O Nanoflowers as a New Class of Magnetic Theranostic Platform for In Vivo T1 -T2 Dual-Mode Magnetic Resonance Imaging and Magnetic Hyperthermia Therapy.
Xiaoli Liu,Xiaoli Liu,Cheng Teng Ng,Prashant Chandrasekharan,Hai Tao Yang,Lingyun Zhao,Erwin Peng,Yun Bo Lv,Wen Xiao,Jie Fang,Jiabao Yi,Huan Zhang,Kai-Hsiang Chuang,Boon-Huat Bay,Jun Ding,Haiming Fan +15 more
TL;DR: Results have demonstrated that the innovative Fe0.6 Mn0.4 O nanoflowers can be a new magnetic theranostic platform for in vivo T1 -T2 dual-mode MRI and magnetic thermotherapy, thereby achieving a one-stop diagnosis cum effective therapeutic modality in cancer management.
Journal ArticleDOI
The 10% Gd and Ti co-doped BiFeO3: A promising multiferroic material
M. A. Basith,Areef Billah,M. A. Jalil,Nilufar Yesmin,Mashnoon Alam Sakib,Emran Khan Ashik,S. M. Enamul Hoque Yousuf,Sayeed Shafayet Chowdhury,Md. Sarowar Hossain,Shakhawat H. Firoz,Bashir Ahmmad +10 more
TL;DR: In this paper, the structural analysis and phase identification of multiferroic ceramics were performed using Rietveld refinement, and the results indicated that the substitution of 10% Gd and Ti in place of Bi and Fe, respectively, in BiFeO3 significantly enhances its multi-dimensional properties.
Journal ArticleDOI
Microstructural, optical and magnetic characterizations of BiFeO 3 multiferroic nanoparticles synthesized via a sol-gel process
TL;DR: In this paper, high-purity BiFeO3 (BFO) nanoparticles were synthesized via a sol-gel process using a distorted rhombohedral perovskite structure with a space group of R3c.
Journal ArticleDOI
Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO 3 multiferroics
TL;DR: In this article, the effects of temperature on the magnetic properties of the Bi0.9Gd0.1O3 (x = 0.00 and 0.20) multiferroic system were investigated.
Journal ArticleDOI
Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO$_3$ multiferroics
TL;DR: In this article, the effect of temperature on magnetic properties of Bi$0.9}$Gd$ 0.1}$Fe$_x$O$_3$ (x = 0.10) was investigated.
References
More filters
Journal ArticleDOI
Colossal Magnetoresistant Materials: The Key Role of Phase Separation
TL;DR: In this paper, a large variety of experiments reviewed in detail here contain results compatible with the theoretical predictions, including phase diagrams of manganite models, the stabilization of the charge/orbital/spin ordered half-doped correlated electronics (CE)-states, the importance of the naively small Heisenberg coupling among localized spins, the setup of accurate mean-field approximations, and the existence of a new temperature scale T∗ where clusters start forming above the Curie temperature, the presence of stripes in the system, and many others.
Journal ArticleDOI
Beating the superparamagnetic limit with exchange bias
Vassil Skumryev,Stoyan Stoyanov,Yong Zhang,George C. Hadjipanayis,Dominique Givord,Josep Nogués +5 more
TL;DR: It is shown that magnetic exchange coupling induced at the interface between ferromagnetic and antiferromagnetic systems can provide an extra source of anisotropy, leading to magnetization stability.
Journal ArticleDOI
Exchange Anisotropy—A Review
TL;DR: Exchange anisotropy describes a magnetic interaction across the interface between two magnetic materials as discussed by the authors, and it has been found to exist between ferro-antiferromagnetic materials, ferri−antiferrous materials, and ferri-ferromagnetic material.
Journal ArticleDOI
Model for exchange bias in polycrystalline ferromagnet-antiferromagnet bilayers
TL;DR: In this article, a model for polycrystalline ferromagnetic-antiferromagnet bilayers is described, in which independent antiferromagnetic grains are coupled by direct coupling to the net moments at the interfaces of the grains and by spin-flop coupling.
Journal ArticleDOI
A new paradigm for exchange bias in polycrystalline thin films
TL;DR: A review and overview of a series of works generated in our laboratory over the last 5 years can be found in this paper, where the authors described the development and evolution of a new paradigm for exchange bias in polycrystalline thin films with grain sizes in the range 5-15nm.