Magnetization steps in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>[</mml:mo><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant="normal">salen</mml:mi><mml:mo>)</mml:mo><mml:mi mathvariant="normal">Cl</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>]</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Shapira, Y.; Liu, M. T.; Foner, S.; Dubé, Christopher E.; Bonitatebus, Peter J.

doi:10.1103/physrevb.59.1046

Cited by 32 publications

(57 citation statements)

References 28 publications

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“…This system exhibits a change of the slope in the normal incidence M(μ 0 H ) curves at around 1.2 T. This feature hints to a switch of the magnetic state from low to high J z triggered by the Zeeman energy. Such field-induced crossovers of magnetic states have been reported in molecular magnets [61,62] and Fe atoms on Pt(111) [63]. This peculiar shape of the magnetization curves, as well as the XAS spectra acquired at different fields, allow us to determine the magnetic level splitting with very high accuracy.…”

Section: Crystal Field and 4 F Occupancy: Er Atoms On Ag(100) And mentioning

confidence: 87%

4f occupancy and magnetism of rare-earth atoms adsorbed on metal substrates

et al. 2017

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We report x-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements as well as multiplet calculations for Dy, Ho, Er, and Tm atoms adsorbed on Pt(111), Cu(111), Ag(100), and Ag(111). In the gas phase, all four elements are divalent and we label their 4f occupancy as 4f n . Upon surface adsorption, and depending on the substrate, the atoms either remain in that state or become trivalent with 4f n−1 configuration. The trivalent state is realized when the sum of the atomic correction energies (4f →5d promotion energy E f d + intershell coupling energy δE c ) is low and the surface binding energy is large. The latter correlates with a high substrate density of states at the Fermi level. The magnetocrystalline anisotropy of trivalent RE atoms is larger than the one of divalent RE atoms. We ascribe this to the significantly smaller covalent radius of the trivalent state compared to the divalent one for a given RE element. For a given valency of the RE atom, the anisotropy is determined by the overlap between the spd states of the RE and the d states of the surface. For all investigated systems, the magnetization curves recorded at 2.5 K show absence of hysteresis indicating that magnetic relaxation is faster than about 10 s.

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Section: Crystal Field and 4 F Occupancy: Er Atoms On Ag(100) And mentioning

confidence: 87%

4f occupancy and magnetism of rare-earth atoms adsorbed on metal substrates

et al. 2017

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“…The cross-over field roughly coincides with the maximum in the dM/dH curve, ca 30 kOe. The further increase in the derivative above 90 kOe indicates that another spin state with S> 1 starts to be populated as an effect of the applied magnetic field [6,17,18].…”

Section: Magnetic Properties Of Cr 8 Nimentioning

confidence: 99%

Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Möbius strip

Cador

Gatteschi

Sessoli

et al. 2005

Journal of Magnetism and Magnetic Materials

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The magnetic properties of the first odd-member antiferromagnetic ring comprising eight chromium(III) ions, S=3/2 spins, and one nickel(II) ion, S=1 spin, are investigated. The ring possesses an even number of unpaired electrons and a S=0 ground state but, due to competing AF interactions, the first excited spin states are close in energy. The spin frustrated ring is visualized by a Möbius strip. The "knot" of the strip represents the region of the ring where the AF interactions are more frustrated. In the particular case of this bimetallic ring electron paramagnetic resonance (EPR) has unambiguously shown that the frustration is delocalized on the chromium chain, while the antiparallel alignment is more rigid at the nickel site.

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“…In the literature, this phenomenon has been pointed out to explain humps in the magnetization process of Fe 2 in the pulse magnetic eld. 23) In this way the present mechanism is quite general although its quantitative properties depends on the details of situation.…”

Section: {22)mentioning

confidence: 99%

Magnetic Foehn Effect in Adiabatic Transition

Saito

Miyashita

2001

J. Phys. Soc. Jpn.

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The magnetization process as a response to a sweeping magnetic eld in the thermal environment is investigated by using the quantum master equation. In a slow sweeping velocity region where the system shows quasi-adiabatic motion, a magnetic plateau in the magnetization process has been observed in the recent experiment of V 15 [Phys. Rev. Lett. 84 (2000) 3454]. Although the experiment was explained from a view of small capacity of the phonon heat bath, i.e., the phonon bottleneck eect, we found that a magnetic plateau appears almost regardless of the properties of the heat bath in the quasi-adiabatic transition and the appearance of the plateau is quite universal. We call it 'Magnetic Foehn eect'. On the other hand, the magnetic plateau also appears in a fast sweeping velocity region by the Landau{Zener{Stückelberg mechanism which is dierent from the above mechanism in a slow sweeping region, and we study the crossover between them. We also propose an experiment which claries the structure of coupling to the thermal reservoir.KEYWORDS: nonadiabatic transition, magnetic tunneling x1. IntroductionProperties of quantum dynamics have been studied extensively for nanoscale magnets and also in microscopic system with nanostructure. 1{3) Energy levels as a function of the external eld form many avoided level crossing points. When the eld is swept, the probability of each diabatic state is scattered to other states. Such scattering mechanism is well described by Landau, Zener, and Stükelberg (LZS) mechanism 4{6) where the scattering probability is given as a function of the sweeping velocity and energy gap at the avoided level crossing point. The LZS probability was originally derived for a two-level system. Nevertheless it has been successfully applied to multi-level system to analyze phenomena related to the nonadiabatic transition. 1{3,7{9) However, realistic experiments are always exposed to a thermal environment. Hence the study on the nonadiabatic transition with eects of environment is quite crucial for further understanding of time-dependent phenomena in microscopic systems. For example, in the recent experiments of uniaxial molecular magnets such as Mn 12 and Fe 8 which show a step-wise magnetization process, the dissipative eects cannot be neglected even at very low temperatures.1,2,10) In multilevel systems, the nonadiabatic transitions successively occur at the avoided level crossing points. It was found that in these experiments, the shape of magnetization curve cannot be explained only by the modication of the LZS transition probability. We studied this discrepancy by a quantum master equation and found that even at very low temperatures, the relaxation between levels with the same sign of magnetization easily occurs although it is not allowed in the pure quantum system. 11) As a result of a composite mechanism of nonadiabatic changes of state and a fast relaxation to the ground state, the magnetization process in such molecule magnets shows a step-wise curve which is dierent from the pure quantum cas...

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Magnetization steps in[Fe(salen)Cl]2

Cited by 32 publications

References 28 publications

4f occupancy and magnetism of rare-earth atoms adsorbed on metal substrates

4f occupancy and magnetism of rare-earth atoms adsorbed on metal substrates

Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Möbius strip

Magnetic Foehn Effect in Adiabatic Transition

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