Femtosecond Dynamics of the Collinear-to-Spiral Antiferromagnetic Phase Transition in CuO

Johnson, S. L.; Souza, R. A. de; Staub, U.; Beaud, P.; Möhr-Vorobeva, E.; Ingold, G.; Caviezel, Andrin; Scagnoli, V.; Schlotter, W. F.; Turner, James J.; Krupin, O.; Lee, W.-S.; Chuang, Yi‐De; Patthey, L.; Moore, Robert; Lü, Donghui; Yi, Ming; Kirchmann, Patrick S.; Trigo, M.; Denes, P.; Doering, D.; Hussain, Zahid; Shen, Z.‐X.; Prabhakaran, D.; Boothroyd, A. T.

doi:10.1103/physrevlett.108.037203

Cited by 106 publications

(90 citation statements)

References 36 publications

(37 reference statements)

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“…Residual diffraction peak intensity for even the highest fluence is likely a result of a small misalignment between pump and probe beams and relatively similar spot sizes. At low fluences, the decay time appears to be nearly constant, but then decreases as the decay amplitude saturates with complete melting of the long-range magnetic order; extracted time constants range from 22.4 ps at the lowest fluence to 7.5 ps at the highest fluence, much slower than time constants of <1 ps recorded for melting of magnetic order in other materials [10,12,16]. …”

Section: Resultsmentioning

confidence: 72%

“…Time-resolved resonant X-ray diffraction has been used to probe ultrafast changes in magnetic order in several oxides [10][11][12][13]. For example, we have recently shown that THz excitation can resonantly drive a magnon, which leads to a tilt of the spin cycloid structure in TbMnO3 due to magnetoelectric coupling [13].…”

Section: Introductionmentioning

confidence: 99%

“…For example, we have recently shown that THz excitation can resonantly drive a magnon, which leads to a tilt of the spin cycloid structure in TbMnO3 due to magnetoelectric coupling [13]. In other materials, such as CuO or La0.5Sr1.5MnO4, it was observed that pumping with 800 nm light leads to an ultrafast suppression of magnetic order in less than 1 ps and that the magnetic phase transformation is delayed by approximately ¼ of the period of the low lying spin gap excitation [10,12]. Such ultrafast changes in magnetization (less than 1 ps) have also been observed in metallic ferromagnets via all optical pump/probe schemes and optical pump/XMCD (X-ray magnetic circular dichroism) probe experiments [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic order dynamics in optically excited multiferroicTbMnO3

Johnson¹,

Kubacka²,

Hoffmann³

et al. 2015

Phys. Rev. B

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We performed ultrafast time-resolved near-infrared pump, resonant soft X-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system and the spin cycloid magnetic order in multiferroic TbMnO3 at low temperatures. We observe melting of the long range antiferromagnetic order at low excitation fluences with a decay time constant of 22.3 ± 1.1 ps, which is much slower than the ~1 ps melting times previously observed in other systems. To explain the data we propose a simple model of the melting process where the pump laser pulse directly excites the electronic system, which then leads to an increase in the effective temperature of the spin system via a slower relaxation mechanism. Despite this apparent increase in the effective spin temperature, we do not observe changes in the wavevector q of the antiferromagnetic spin order that would typically correlate with an increase in temperature under equilibrium conditions. We suggest that this behavior results from the extremely low magnon group velocity that hinders a change in the spin-spiral wavevector on these time scales.2

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Section: Resultsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic order dynamics in optically excited multiferroicTbMnO3

Johnson¹,

Kubacka²,

Hoffmann³

et al. 2015

Phys. Rev. B

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“…More recently, extensive studies have been reported by the Oxford group. [28][29][30] Structure and properties:. The lattice structure of CuO is illustrated in Figure 1 and its magnetic cycloidic spin arrangement in Figure 2.…”

Section: Copper Oxidementioning

confidence: 99%

Room-temperature multiferroic magnetoelectrics

2013

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A short review is given of the recent work on single-phase crystals that are ferroelectric and ferromagnetic at or near room temperature. BiFeO 3 is mentioned only briefly, because it has been reviewed in detail elsewhere very recently; emphasis instead is on copper oxide, perovskite oxides with mixed B-site occupancy (such as Pb(Fe 1/2 Ta 1/2 ) x (Zr y Ti INTRODUCTIONMultiferroics are usually defined as single-phase crystals exhibiting at the same temperature and pressure both ferromagnetism (or antiferromagnetism) and ferroelectricity (or antiferroelectricity). As most ferroelectrics are also ferroelastic 1 (hysteretic stress-strain relationships), the 'multi-ferro' label often includes three coupled order parameters. (As a peripheral comment, we note that it is necessary and sufficient 2 for a ferroelectric to be ferroelastic if its phase transition changes the crystal class-for example, from orthorhombic to tetragonal-treating hexagonal and trigonal as a single super-class. Examples of nonferroelastic ferroelectrics include KTiOPO 4 and LiNbO 3 , whose ferroelectric transitions are, respectively, orhorhombic-orthorhombic and trigonal-trigonal.)The interest in multiferroics at present is growing rapidly, and the interest is twofold: from a fundamental point of view the coupling between spins and lattices in crystals-between magnetism and ferroelectricity and/or structural phase transitions-has been recognized as complex and fascinating for several decades, generally requiring low-symmetry materials that were carefully avoided in earlier days of solid state theory. A good reason why it is presented in the elegant work by Schmid and Trooster 3 on the boracites: These materials (for example, nickel-iodine boracite) are multiferroic only at cryogenic temperatures and grow in needle-like structures, making them impractical for commercial device applications; and theoretically they exhibit low symmetry (monoclinic or triclinic) and have as many as 96 atoms per unit cell, making them theoretically formidable. Despite these drawbacks, multiferroics present a possible avenue for the next generation of computer digital memories, combining at least in principle, the high-speed and low-power consumption 4,5 of a ferroelectric random access memory (FRAM) with the nondestructive READ operation of a magnetic RAM. We discuss below why these goals will not be easy to achieve in commercial products:The most serious problems are operational temperature (most multiferroics operate well below ambient) and magnitudes of magnetization (all multiferroics with reasonably high operating temperatures are weak ferromagnets-canted antiferromagnetswhereas a strong ferromagnet is desired), and the switched polarization is also extremely weak. The polarization in most multiferroics is so weak that authors measure it in nC m À2 rather than the older customary mC cm À2 . Keep in mind that equally good SI units would be C hectare À1 for these multiferroics, a value far lower than the roughly 1 mC cm À2 required by a computer memory sense ampl...

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“…This advantage has been recently employed to trigger ultrafast spin dynamics and spin reorientation in antiferromagnets. [7][8][9][10] Combining these two different classes of materials in a FM/AFM heterostructure could thus produce a composite material with novel dynamical properties.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of laser-induced spin reorientation in Co/SmFeO3heterostructure

et al. 2013

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Ultrafast control of a ferromagnet (FM) via exchange coupling with an antiferromagnet (AFM) is demonstrated in a Co/SmFeO 3 heterostructure. Employing time-resolved photoemission electron microscopy combined with x-ray magnetic circular dichroism, a sub-100-ps change of the Co spins orientation by up to 10 • driven by the ultrafast heating of the SmFeO 3 orthoferrite substrate through its spin reorientation phase transition is revealed. Numerical modeling of the ultrafast-laser-induced heat profile in the heterostructure, and the subsequent coupled spins dynamics and equilibration of the spin systems suggest that the localized laser-induced spin reorientation is hindered compared with the static case. Moreover, numerical simulations show that a relatively small Co/SmFeO 3 exchange interaction could be sufficient to induce a complete and fast spin reorientation transition (SRT).

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Femtosecond Dynamics of the Collinear-to-Spiral Antiferromagnetic Phase Transition in CuO

Cited by 106 publications

References 36 publications

Magnetic order dynamics in optically excited multiferroicTbMnO3

Magnetic order dynamics in optically excited multiferroicTbMnO3

Room-temperature multiferroic magnetoelectrics

Dynamics of laser-induced spin reorientation in Co/SmFeO3heterostructure

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