Nanosize effect: Enhanced compensation temperature and existence of magnetodielectric coupling in 
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Chaturvedi, Smita; Shyam, Priyank; Bag, Rabindranath; Shirolkar, Mandar M.; Kumar, Jitender; Kaur, Harleen; Singh, Surjeet; Awasthi, A. M.; Kulkarni, Sulabha K.

doi:10.1103/physrevb.96.024434

Cited by 48 publications

(28 citation statements)

References 70 publications

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“…The observation of this transition cannot be explained on the basis of the previously observed SR phenomenon, which has been generally reported at the temperature in the order of 480 K. Indeed, below the Neel temperature, near 670 K, the weak ferromagnetic moments (associated to the Fe-sublattice spins of the SmFeO3 phase) are expected to re-orient from the c-axis towards the a-axis. It has been shown that this effect observed at approximately 480 K causes the c-axis susceptibility to decrease rapidly below this temperature, and simultaneously, the a-axis susceptibility to rise sharply [25]. Furthermore, the observed transition is not compatible with possible exchange bias effects, since no unusual magnetization or coercivity shifts in the hysteresis loops were found at different temperatures as shown in Fig.7A-B and Fig.8.…”

Section: Resultsmentioning

confidence: 66%

“…Instead, considering the low temperature magnetic properties of SmFeO3, an important observation can be made. Indeed at cryogenic temperatures, the magnetization of SmFeO3 has been reported to exhibit a spontaneous magnetization reversal [15,17,18,19,25]. This reversal has been previously attributed to a compensation effect of the weak ferromagnetic moment (associated to the Fe-sublattice spins of the SmFeO3 phase) by antiparallel alignment of the Sm 3+ moments.…”

Section: Resultsmentioning

confidence: 99%

“…This reversal has been previously attributed to a compensation effect of the weak ferromagnetic moment (associated to the Fe-sublattice spins of the SmFeO3 phase) by antiparallel alignment of the Sm 3+ moments. Additionally from the bulk susceptibility is has been suggested that below the temperature of about 140 K, Sm 3+ moments would begin to order antiparallel to the Fe-moments due to antiferromagnetic f-d exchange interactions between the two magnetic sub-lattices [25]. Interestingly, recent measurements by Y. K. Jeong et al [19] revealed a change in the slope of the magnetization curves in their FC measurements from the temperature of approximately 135 K; but no clear magnetization peak was reported.…”

Section: Resultsmentioning

confidence: 99%

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Observation of enhanced magnetic transition in Pbnm SmFeO3

Wang

Sameera

Wang

et al. 2017

Journal of Applied Physics

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Abstract:Rare-earth orthoferrites RFeO3 materials have recently attracted a great attention for their intriguing technolgical potential. Among these materials, SmFeO3 holds great promise not only for the excellent physical properties (fast magnetic switching, spin reorientation and magnetization reversal) but also for its potential ferroelectric properties which have been recently under debate. Here we focus our attention on T-dependent Zero Field Cooled (ZFC) and Field Cooled (FC) magnetization properties of micrometer scale crystals of SmFeO3 obtained by annealing methods.We report the observation of an enhanced magnetic transition at the temperature of approximately 139 K. From literature bulk susceptibility measurements, is has been suggested that below the temperature of about 140 K, Sm 3+ moments begin to order antiparallel to the Fe-moments due to antiferromagnetic f-d exchange interactions. We attribute the observed transition to compensation effects induced by the appearance of long range ordering in Sm 3+ spins. The magnetic-nature of the observed transition is confirmed by additional temperature dependent XRD analysis which did not show structural changes of the samples in the same temperature range (from 298 K to 100 K). Due to residual small fractions of ferromagnetic -Fe from the sample-growth, possible interactions between the magnetic moment of -Fe and the SmFeO3 crystals at the compensation temperature can not be excluded and could be at the origin of the enhanced magnetic signal reported in this work. IntroductionRare-earth orthoferrites RFeO3 (R= rare-earth ion) materials have recently attracted a great attention for their intriguing physical properties, ideal for numerous technological applications, such as ultrafast photo-magnetic recording [1-4], inertia-driven spin switching [5], laser-induced ultrafast spin reorientation [6][7], magnetic biasing on P-E hysteresis loops [8], enhanced magnetoelectric interactions [9,10], multiferroics, ferroelectrics [11][12][13][14][15]. The family of RMO3 materials is generally characterized by a distorted perovskite Pbnm structure which exhibits a weak ferromagnetic behavior due to a small canting of the antiferromagnetic metal sub-lattices (M

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Observation of enhanced magnetic transition in Pbnm SmFeO3

Wang

Sameera

Wang

et al. 2017

Journal of Applied Physics

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“…В последние годы при исследовании микро-и нанокристаллических образцов SFO обнаружено, что уменьшение размера частиц приводит к заметным изменениям структурных и физических (магнитных и сегнетоэлектрических) свойств [8,9]. Наномасштабные эффекты на структуру и физические свойства мультиферроиков были в центре внимания многих недавних исследований в области материаловедения.…”

Section: Introductionunclassified

Термодинамические свойства и фазовые переходы микрокристаллической и наноструктурированной керамики SmFeO-=SUB=-3-=/SUB=-

Каллаев¹,

Алиханов²,

Омаров³

et al. 2019

Физика Твердого Тела

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The heat capacity and dielectric properties of microcrystalline and nanostructured SmFeO_3 ceramics obtained by solid phase synthesis are studied. The ceramics is synthesized by the treatment of the batch at room temperature in Bridgman anvils by forceful action combined with shear deformation followed by sintering. It is established that the mechanoactivation results in noticeable broadening antiferromagnetic–ferroelectric transition and shifting the temperature of phase transition in the low-temperature area. The phase transition having typical for relaxation oscillator frequency dependent character is found at 558 K. It is shown that the defect structure can take a dominant place in the formation of the physical properties of ceramics.

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“…В последние годы при исследовании микро-и нанокристаллических образцов SFO обнаружено, что уменьшение размера частиц приводит к заметным изменениям структурных и физических (магнитных и сегнетоэлектрических) свойств [6,7]. Интерес к наноструктурированным оксидам обусловлен потенциальными возможностями их Каллаев С.Н., Садыков С.А., Алиханов Н.М.-Р., Омаров З.М., Билалов А.Р., Абдулвахидов К.Г., Абдуллаев Х.Х.…”

Section: Introductionunclassified