Magnetic phase diagrams of

Abstract

For the compound of wolframite structure three antiferromagnetic phases are known to exist in the absence of an external field. In this contribution we present the magnetic phase diagrams up to a field strength of 20 T. The plane spanned by the easy direction and the orientation of the twofold screw axes is exposed for the application of external magnetic fields, and the change in the topology of the phase diagrams with the variation of the specific field direction within this plane is described in detail. The application of an external magnetic field perpendicular to this plane hardly affects the stability ranges of any of the phases.

A new multiferroic material: MnWO4

“…According to Ref. [14] the transition from the AF2 to the AF1 phase is suppressed in fields above about 2 T for this field direction (see Fig. 1).…”

“…Our magnetic measurements, see below, confirm the presence of at least two magnetic transitions, one around 13 K and a second one around 6 K, but we were unable to resolve two separate transitions at 12.3 and 13.5 K. According to Refs. [13,14] the separate transitions around 13 K can probably be much better resolved by e.g. specific heat measurements than in magnetic data.…”

“…MnWO 4 (also known as the mineral hübnerite) appears to be just such a system. Detailed studies of the magnetic ordering in this material have shown [13,14] that below 12.3 K a spiral magnetic ordering develops which seems to satisfy the criterion of Eq. (1).…”

Hierarchical MnMoO4/CoMoO4 heterostructured nanowires with enhanced supercapacitor performance

“…The molybdates MnMoO 4 and CoMoO 4 have excellent catalytic and electrochemical characteristics [21][22][23] . In this paper, hierarchical MnMoO 4 /CoMoO 4 heterostructured nanowires were controllably synthesized using a facile refluxing method under mild conditions.…”

Neutron Laue Diffraction Study on the Magnetic Phase Diagram of MultiferroicMnWO4under Pulsed High Magnetic Fields

“…The magnetic field was applied along [2,0,1], which deviates by 7 from the magnetic easy axis [10,11]. The phase diagram is known to be insensitive to small deviations in the field alignment [16]. Figure 3(a) shows the time integrated Laue images at B ¼ 0T , where the horizontal and the vertical axes are along the ( À h,2h,2h) and (2k,0,k) directions, respectively.…”