We report the observation of enhanced magnetization in graphene oxide (GO) after thermal annealing. have also proposed that this enhancement is due to increased density zigzag edges. conjecture on annealing random epoxy groups native GO migrate over surface by acquiring energy and self-assemble form several long chains groups. Subsequently, upon reduction sheet unzipped along these giving rise more edges, resulting magnetization. found out plays an important role unzipping process. If low,...

We report multiple first order magnetic transitions in TbMn2Si2 as evidenced by the thermal hysteresis M-T data and Arrott plots. Metamagnetic are observed at various temperatures a result of antiferromagnetic to ferromagnetic transition Mn sublattice. Very interestingly, compound shows significant exchange bias field about 600 Oe 5 K, which is attributed formation small domains or regions with interactions. Furthermore, large magnetocaloric effect has been found relatively low fields both...

The magnetic ground state of the Mn50Ni38.5Sn11.5 alloy is investigated through dc/ac magnetization and low-temperature specific-heat measurements. dc ac measurements indicate that system can be identified as a cluster spin glass (CSG) phase in ferromagnetic (FM) background, conjunction these two phases an exchange bias effect (EBE) observed this system. presence coexisting further supported by our measurement. We attribute existence CSG to antiferromagnetic (AFM) interaction arising from...

The Ni50Mn37Sb13 ribbons were prepared by melt-spinning technique to overcome the brittleness of bulk. A single phase austenite with L21 structure was confirmed in as-spun and annealed at room temperature similar We observe increments martensite transformation (TM) from 238 K 252 Curie (TCA) 336 342 after annealing ribbon. exchange bias, magnetic entropy change (ΔSM), magnetoresistance are found increase 380 Oe 415 Oe, 1 J/kg-K 3 (ΔH=50 kOe), −4% −13% respectively, possible reasons for...

We report a study of magnetization, resistivity, magnetoresistance, and specific heat the pyrochlore iridate ${({\mathrm{Eu}}_{1\ensuremath{-}x}{\mathrm{Nd}}_{x})}_{2}{\mathrm{Ir}}_{2}{\mathrm{O}}_{7}$ with $x=0.0$, 0.5 1.0, where spin-orbit coupling, electronic correlation, magnetic frustration, Kondo scattering coexist. The metal insulator transition temperature (${T}_{MI}$) decreases increase in Nd content, but always coincides irreversibility (field-induced moment). Resistivity below...

In this investigation we show that the optimum substitution of Ni by Co and Cu can bring martensite transition temperature (TM = 390 K) Ni46Mn43In11 alloy close to room as well greatly influence applicable magnetic transport properties. contrast parent alloy, a ferromagnetic austenite phase is induced in these substituted alloys. A huge exchange bias field up 1615 Oe was observed for field-cooled hysteresis loop at 5 K Ni44Cu2Mn43In11 alloy. giant entropy change 20.8 J kg−1K−1 70 kOe...

Abstract The influence of martensite and austenite phase volume fractions on the magnetoresistance have been studied across first order transformation Ni 44 Cu 2 Mn 43 In 11 compound. different are calculated by measuring resistivity as a function temperature magnetic field. Our experiment reveals that field-induced fraction ( f IA ) at any depends availability instability M temperature. This is found to contribute most significantly observed large (MR), while contributions from parent...

In this report, we present a systematic study of magnetic behavior transition metal (TM = Fe or Cu) doped ZnO and co-doped (Cu, Fe) nanoparticles. All the samples show antiferromagnetic (AFM) like inverse susceptibility at low temperatures. all AFM Curie-Weiss temperature TAFM increases with increase in TM ion concentration indicating enhanced correlation upon doping. We observe crossover from state to ferromagnetic around (T) 100–150 K. shall try explain experimental observations by...

We report anomalous magnetic reversal (MR)/negative magnetization (NM) state associated with the field induced switching of orbital moment (μLSm) Sm atom. This material shows an antiferromagnetic transition at Néel temperature (TN∼240 K) followed by a NM in between compensation temperatures (T∗ and T∗∗). The MR/NM vanishes above 12.5 kOe, while T∗ T∗∗ follow opposite dependency cooled cooling (FCC) magnetization. In high (H>20 kOe), thermo-magnetization [M(T)] curve produces mirror...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation B. Ghosh, K. Bagani, M. Ray, Sardar, S. Banerjee; Re-entrant magnetic phases in CaFeO3 nanoparticle. AIP Conf. Proc. 3 June 2013; 1536 (1): 943–944. https://doi.org/10.1063/1.4810541 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search...

Micron size Fe3O4 powders were chemically prepared and processed by radio frequency (13.56 MHz) oxygen plasma irradiation technique at different elevated temperatures using low (RF) power level. Low magnetic field RF superconducting quantum interference device (SQUID) magnetization studies performed up to a maximum of 100 Oe, which was well below the tolerance factor human beings (down 5 K). Heat-treated in showed significant changes blocking temperature, susceptibility, are important...

We have studied the phase volume fraction related magnetoresistance (MR) across first order martensite transformation (MT) of Ni44Cu2Mn43In11 alloy. Within metastability MT, an isothermal application magnetic field converts into austenite. The induced austenite (fIA) at any temperature depends on availability and instability (fM ) that temperature. This fIA is found to contribute most significantly observed giant MR while contribution from pure negligible. It net follows a non linear...

We report the specific heat of graphite, highly oriented pyrolytic graphite (HOPG), graphene oxide (GO), and reduced (RGO) from 300 K to 50 mK. Graphite HOPG exhibits transition three dimensions $({C}_{v}\ensuremath{\propto}{T}^{3})$ two $({C}_{v}\ensuremath{\propto}{T}^{2})$ as temperature increases above 4 approaching linearity in for both around room is observed. observe a Schottky-like peak near 0.1 K, whose intensity position varies with external magnetic field. find that random...

We report here electrical and magnetic properties of Al62Cu25.5Fe12.5 icosahedral quasicrystal. have measured the resistivity from 2K to 300K observed negative temperature coefficient above 15K. Below 15K we see a decrease in showing maxima around Upon application high field 5 Tesla disappears below 15 K rises sharply. Magnetoresistance was at various temperatures as function applied observe positive magnetoresistance for all temperatures. attributed these effects arising due spin-orbit scattering.