First-order reversal curve of the magnetostructural phase transition in FeTe

Abstract

We apply the first-order reversal curve (FORC) method, borrowed from studies of ferromagnetic materials, to the magneto-structural phase transition of Fe1+yTe. FORC measurements reveal two features in the hysteretic phase transition, even in samples where traditional temperature measurements display only a single transition. For Fe1.13Te, the influence of magnetic field suggests that the main feature is primarily structural while a smaller, slightly higher-temperature transition is magnetic in origin. By contrast Fe1.03Te has a single transition which shows a uniform response to magnetic field, indicating a stronger coupling of the magnetic and structural phase transitions. We also introduce uniaxial stress, which spreads the distribution width without changing the underlying energy barrier of the transformation. The work shows how FORC can help disentangle the roles of the magnetic and structural phase transitions in FeTe.

Study of Structural and Magnetotransport Properties of Fe(Te, Se) Single Crystals

“…For the FeTe 0.88 sample, the transition observed in the ρ – T measurement near ≈60 K is due to the simultaneous tetragonal to orthorhombic and antiferromagnetic transitions . This single transition in the resistivity curve of FeTe 0.88 shows the coupling between structural and AFM ordering . In the resistivity curve of FeTe 0.90 Se 0.10 , shifting of the AFM/structural transition from 60 to 45 K is observed.…”

Tunable Low Density Palladium Nanowire Foams

“…[31][32] Lastly, we investigate hysteresis in the desorption process using the first order reversal curve (FORC) technique, 34 which can provide insight into intrinsic properties and interactions in hysteretic systems. [35][36][37][38][39][40] Using a procedure analogous to previous studies, the sample is initially prepared in the un-hydrogenated state, then dosed with hydrogen, driving it to a reversal pressure, PR, at which point the sample is in a mixed state of Pd and PdHx. After reaching PR, the applied pressure, P, is decreased while measuring the net absorption, Q(P, PR), and the sample is This may suggest that both the Pd and the PdH phases could be changing composition, and a combination of thermodynamic and kinetic factors may be at play.…”

Reconstructing phase-resolved hysteresis loops from first-order reversal curves

“…[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] However, the correlation between the FORC distribution and traditional magnetometry is frequently nontrivial. Although the FORC technique can be used on virtually any hysteretic system with defined saturated states, [28][29][30] it is most commonly applied to magnetism. [31][32][33] While it is expected that the FORC distribution contains the traditional magnetometry metrics, such as coercivity and saturation fields, and the remanent and saturation magnetization, limited discussion exists on exactly how to capture these values.…”