(Sr,Mn)TiO3: A Magnetoelectric Multiglass

Abstract

By close analogy with multiferroic materials with coexisting long-range electric and magnetic orders a "multiglass" scenario of two different glassy states is observed in Sr(0.98)Mn(0.02)TiO(3) ceramics. Sr-site substituted Mn2+ ions are at the origin of both a polar and a spin glass with glass temperatures T(g) approximately equal to 38 K and < or =34 K, respectively. The structural freezing triggers that of the spins, and both glassy systems show individual memory effects. Thanks to strong spin-phonon interaction within the incipient ferroelectric host crystal SrTiO3, large higher order magnetoelectric coupling occurs between both glass systems.

Large magnetoelectric coupling in nanoscaleBiFeO3from direct electrical measurements

“…We further mention that even though the magnetoelectric effect observed here is primarily intrinsic in nature, the interface can have a finite contribution to the overall effect in the way described below. The disordered interface itself is expected to exhibit magnetoelectric effect since such a disordered spin and polar glass system is known to exhibit magnetoelectric effect [30,31]. The nonswitchable polarization component of the interface (i.e., dead layer), in fact, gives rise to the depolarizing field which reduces the intrinsic ferroelectric polarization [32][33][34].…”

Phase Transitions in Layered Semiconductor - Ferroelectrics

“…Magnetic measurements were performed using a SQUID magnetometer (Quantum Design MPMS-5S) at temperatures from 5 to 300 K and magnetic fields up to 5 T. For magnetoelectric measurements we used a modified SQUID ac susceptometer (Borisov et al, 2007), which measures the first harmonic of the ac magnetic moment induced by an external ac electric field. To address higher order ME effects, additional dc electric and/or magnetic bias fields are applied (Shvartsman et al, 2008). At higher In 3+ contents, x ≥ 0.4, no AF cusps appear any more and the monotonic increase of M on cooling extends to the lowest temperatures, T ≈ 5 K. Obviously the Cr 3+ concentration falls short of the percolation threshold of the exchange interaction paths between the Cr 3+ spins, which probably occurs at x ≈ 0.3.…”

“…The possible coexistence of this spin glass phase with the dipolar glassy one (Maior et al, 2008) is another timely motivation to study CuCr 1-x In x P 2 S 6 . Indeed, ‛multiglass' behavior was recently discovered in the dilute magnetic perovskite Sr 0.98 Mn 0.02 TiO 3 (Shvartsman et al, 2008), paving the way to a new class of materials, ‛disordered multiferroics' (Kleemann et al, 2009). The above mentioned comparison of the two families of dilute antiferromagnets CuCrP 2 S 6 :In and FeCl 2 :Mg is not fortuitous.…”

Thickness dependence of La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3 magnetoelectric interfaces

“…[1][2][3][4][5][6] Due to the likelihood that ME materials' domains can be switched and maintained at an atomic level with reduced energy cost, [7][8][9][10][11] faster, cheaper, and more sensitive devices could be built by upgrading current media with strong ME materials. Single-phase ME materials, however, are rare and suffer from significant drawbacks (i.e., weak ME coupling/low critical temperatures 12 ).…”