Crystal field effects in the L 23 XMCD of rare earth insulators

Neumann, Claus; Hoogenboom, Bart W.; Rogalev, A.; Goedkoop, J.B.

doi:10.1016/s0038-1098(99)00089-7

Cited by 16 publications

(15 citation statements)

References 24 publications

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“…47,48 The shape and position of this Dy feature are similar to those of other XMCD spectra of insulators containing Dy (Dy 2 O 3 ). 49 Moreover, the L 2,3 -edge XMCD spectra of the {Fe 3 DyO 2 } and {Fe 3 GdO 2 } complexes (Fig. 4) are comparable with those of the binary DyAl 2 and GdAl 2 compounds, and Al-rich Ln(Al 1−x Fe x ) compounds (with Ln = Dy and Gd), shown in Refs.…”

Section: A Xanes and Xmcd At A Constant Fieldsupporting

confidence: 73%

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
22
2
14
0
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The intramolecular exchange interactions within the single-molecule magnet (SMM) "butterfly" molecule [Fe 3 Ln(μ 3 -O) 2 (CCl 3 COO) 8 (H 2 O)(THF) 3 ], where Ln(III) represents a lanthanide cation, are determined in a combined experimental [x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometer (VSM)] and theoretical work. Compounds with Ln = Gd and Dy, which represent extreme cases where the rare earth presents single-ion isotropic and uniaxial anisotropy, on one hand, and with Ln = Lu and Y(III) as pseudolanthanide substitutions that supply a nonmagnetic Ln reference case, on the other hand, are studied. The Dy single-ion uniaxial anisotropy is estimated from ab initio calculations. Low-temperature (T 2.5 K) hard x-ray XMCD at the Ln L 2,3 edges and VSM measurements as a function of the field indicate that the Ln moment dominates the polarization of the molecule by the applied field. Within the {Fe 3 LnO 2 } cluster the Ln-Fe 3 subcluster interaction is determined to be antiferromagnetic in both Dy and Gd compounds, with values J Dy-Fe 3 = −0.4 K and J Gd-Fe 3 = −0.25 K, by fitting to spin Hamiltonian simulations that consider the competing effects of intracluster interactions and the external applied magnetic field. In the uniaxial anisotropic {Fe 3 DyO 2 } case, a field-induced reorientation of the Fe 3 and Dy spins from an antiparallel to a parallel orientation takes place at a threshold field (μ 0 H = 4 T). In contrast, in isotropic {Fe 3 GdO 2 } this reorientation does not occur.

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Section: A Xanes and Xmcd At A Constant Fieldsupporting

confidence: 73%

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
22
2
14
0
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“…The goal of our work is to investigate the accuracy of the proposed superexchange mechanism to explain the nnn predominant interaction between radicals in 1 and to try to understand the origin of the differences of the macroscopic magnetic properties between 1 and 2 . To do that, we report here an X-ray magnetic circular dichroism (XMCD) study of the chains 1 and 2 at the Gd M 4,5 -edges (3d 10 4f 7 → 3d 9 4f 8 transitions, probe of the 4f Gd half-filled orbitals) and L 2,3 -edges (2p 6 4f 7 5d 0 → 2p 5 4f 7 5d 1 transitions, probe of the 5d Gd orbitals). − These compounds were chosen inside the family of Gd(hfac) 3 NITR products because 1 and 2 show the more pronounced antiferromagnetic and ferromagnetic behaviors, respectively.…”

Section: Introductionmentioning

confidence: 99%

XMCD for Monitoring Exchange Interactions. The Role of the Gd 4f and 5d Orbitals in Metal-Nitronyl Nitroxide Magnetic Chains

et al. 2003

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We report here the X-ray magnetic circular dichroism (XMCD) study at the Gd M(4,5)- and L(2,3)-edges of two linear magnetic chains involving Gd(III) cations bridged by nitronyl nitroxide radicals. This spectroscopy directly probes the magnetic moments of the 4f and 5d orbitals of the gadolinium ions. We compare macroscopic magnetic measurements and local XMCD signals. The M(4,5)-edges results are in agreement with the J values extracted from the fits of the SQUID magnetic measurements. The L(2,3)-edges signals show that the electronic density in the Gd 5d orbitals depends on the neighbors of the gadolinium cations. Nevertheless, the 5d orbitals do not seem to play any role in the superexchange pathway between radicals through the metal ion proposed to explain the particular magnetic exchange interactions between the radicals in these chains.

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“…It is very interesting to see that the agreement between theoretical calculation and experiment is very good. Furthermore, our calculations show that the dipolar contribution displays a derivative shape 10 of the spin-averaged spectra, especially in the low energy side ͑see Fig. 3͒.…”

mentioning

confidence: 69%

“…This indicates a clear improvement of the quality of XMCD compared to spectra published previously where this feature could not be detected. 10 The main peak in the XMCD corresponds to the dipolar part, presenting opposite signs at the L 3 and L 2 edges. The arrows indi-a͒ Author to whom correspondence should be addressed; electronic mail: babgroup@physik.fu-berlin.de cate the position of the quadrupolar contributions, where for each edge the sign is opposite to that of the dipolar part.…”

mentioning

confidence: 98%

Quadrupolar and dipolar contributions to x-ray magnetic circular dichroism at the Tb L3,2 edges: Experiment versus theory

Wende

Scherz

et al. 2002

Journal of Applied Physics

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We investigate the x-ray magnetic circular dichroism (XMCD) at the L 3,2 edges using a single crystal of Tb as a prototype system for a one-element magnet in order to ascertain the multipolar nature of the features in the dichroic spectra. The high resolution of the experimental data allows for a clear identification of the dipolar (E1: 2p→5d) and quadrupolar (E2: 2p→4f) transitions. On the basis of ab initio calculations we developed a simple procedure to extract the quadrupolar part by subtracting the derivative of the spin-averaged absorption spectra from the experimental XMCD data. The deconvolution has to be carried out before applying sum rules to determine 4f and 5d moments.

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Crystal field effects in the L 23 XMCD of rare earth insulators

Cited by 16 publications

References 24 publications

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
22
2
14
0
View full text Add to dashboard Cite

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
22
2
14
0
View full text Add to dashboard Cite

XMCD for Monitoring Exchange Interactions. The Role of the Gd 4f and 5d Orbitals in Metal-Nitronyl Nitroxide Magnetic Chains

Quadrupolar and dipolar contributions to x-ray magnetic circular dichroism at the Tb L3,2 edges: Experiment versus theory

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Crystal field effects in the L 23 XMCD of rare earth insulators

Cited by 16 publications

References 24 publications

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(LnBadía-Romano1, Bartolomé2, Bartolomé3 et al. 2013Phys. Rev. B222140View full textAdd to dashboardCite

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(LnBadía-Romano1, Bartolomé2, Bartolomé3 et al. 2013Phys. Rev. B222140View full textAdd to dashboardCite

XMCD for Monitoring Exchange Interactions. The Role of the Gd 4f and 5d Orbitals in Metal-Nitronyl Nitroxide Magnetic Chains

Quadrupolar and dipolar contributions to x-ray magnetic circular dichroism at the Tb L3,2 edges: Experiment versus theory

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About

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
22
2
14
0
View full text Add to dashboard Cite

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
22
2
14
0
View full text Add to dashboard Cite