Simultaneous antiferromagnetic Fe3+and Nd3+ordering in NdFe3(11BO3)4

Fischer, Peter; Pomjakushin, Vladimir; Sheptyakov, Denis; Keller, L.; Janoschek, M.; Roessli, B.; Schefer, J.; Petrakovskiı̌, G. A.; Bezmaternikh, L.; Temerov, V. L.; Великанов, Д. А.

doi:10.1088/0953-8984/18/34/010

Cited by 76 publications

(111 citation statements)

References 16 publications

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“…The above findings for the CM-T and ICM phase are in good agreement with neutron scattering results [15,16]. It was also shown earlier that a magnetic field of 2 T applied to the CM phase suffices to create a mono-domain CM-B state [17,18].…”

supporting

confidence: 90%

“…1, where, for the sake of simplicity, only the two magnetic sublattices of Fe and Nd are shown. These two sublattices are magnetically coupled and undergo two magnetic phase transitions as a function of temperature [15][16][17]: upon cooling, commensurate magnetic (CM) order sets in first at T N ≈ 30 K. In this phase the spins are ordered in a collinear fashion, forming ferromagnetic (FM) ab-planes, which are coupled antiferromagnetically (AFM) along the c-direction. The magnetic The material can be described using the rhombohedral space group R32 with hexagonal unit cell parameters a ≈ 9.5Å and c ≈ 7.5Å at room temperature [14].…”

mentioning

confidence: 99%

“…For modelling the magnetic RXD at the AFM superlattice positions we used the leading first order term of the spherical harmonic expansion of the scattering tensor, F (1) [25,26]. Since the magnetic moments are parallel to the ab-plane [15][16][17] and there is a 3-fold axis along c, only one fundamental spectrum of F (1) enters, allowing us to apply the usual formalism given in Ref. 27.…”

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confidence: 99%

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Control of coexisting magnetic phases by electric fields inNdFe3(BO3)4

Partzsch¹,

Hamann-Borrero

Mazzoli

et al. 2016

Phys. Rev. B

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We present a resonant x-ray diffraction study of the magnetic order in NdFe 3 (BO 3 ) 4 and its coupling to applied electric fields. Our high-resolution measurements reveal a coexistence of two different magnetic phases, which can be triggered effectively by external electric fields. More in detail, the volume fraction of the collinear magnetic phase is found to strongly increase at the expense of helically ordered regions when an electric field is applied. These results confirm that the collinear magnetic phase is responsible for the ferroelectric polarization of NdFe 3 (BO 3 ) 4 and, more importantly, demonstrate that magnetic phase coexistence provides an alternative route towards materials with a strong magnetoelectric response. Frustrated magnetic materials exhibit a large variety of intriguing physical phenomena, including the concomitant appearance of coupled ferroelectric and magnetic orders [1,2]. In fact, interlinked magnetic and ferroelectric orders are very rare in nature. Their discovery in variety of frustrated magnets was therefore a surprise and generated a lot of excitement [3,4], not only because these phenomena are very interesting from the viewpoint of basic research. There is also a significant technological potential [5,6]. Especially since a strong magnetoelectric coupling enables to store information in an extremely energy efficient way [7,8]. Indeed, earlier experiments could demonstrate modifications of a magnetic order related to the reversal of the electric polarization [9][10][11]. These studies, however, were concerned with electric field induced changes within a single magnetic phase or the manipulation of phase stability close to a magnetic transition [12].In the present study we consider a different situation, where frustrated magnetic interactions cause two distinct ordered states to be metastable well below the observed critical temperatures, even in the absence of any first order transition. As a specific example, we investigated the electric field dependence of the magnetic order in NdFe 3 (BO 3 ) 4 , which is a frustrated magnetic material with a large magnetoelectric response [13]. We show that a small perturbation created by an applied electric field allows controlling the stability of the coexisting collinear and helical magnetic orders. This implies that phase coexistence driven by magnetic frustration underlies the magnetoelectric response of NdFe 3 (BO 3 ) 4 , providing an alternative route towards large magnetoelectric effects.The rhombohedral lattice structure of this material is illustrated in Fig. 1, where, for the sake of simplicity, only the two magnetic sublattices of Fe and Nd are shown. These two sublattices are magnetically coupled and undergo two magnetic phase transitions as a function of temperature [15][16][17]: upon cooling, commensurate magnetic (CM) order sets in first at T N ≈ 30 K. In this phase the spins are ordered in a collinear fashion, forming ferromagnetic (FM) ab-planes, which are coupled antiferromagnetically (AFM) along the c-direction. The ...

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confidence: 99%

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Control of coexisting magnetic phases by electric fields inNdFe3(BO3)4

Partzsch¹,

Hamann-Borrero

Mazzoli

et al. 2016

Phys. Rev. B

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“…2,3 However, recent observations of improper ferroelectricity, 4,5 anomalous even within the realm of magnetoelectricity, require an even better understanding of the subject. Rare earth iron borates RFe 3 (BO 3 ) 4 , where R = rare earth, [6][7][8][9] are multiferroics, characterized by long-range magnetic wave vectors q c*, [10][11][12][13][14][15] and show a large magnetoelectric effect ( P ∼ 100 μC m −2 ). The RFe 3 (BO 3 ) 4 crystal structure 16,17 allows a dominant Fe-Fe exchange interaction, which is reflected by a T N in a narrow temperature range (30-40 K) for compounds with different R. The rare earth exchange interaction takes place via O and B, i.e., R-O-B-O-R.…”

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confidence: 99%

“…To understand the magnetic structure of these compounds neutron powder diffraction on R = Y, Pr, Nd, Tb, Ho, and Er, [12][13][14][15] resonant magnetic x-ray scattering on R = Gd, 11 and nonresonant magnetic x-ray scattering on R = Nd, Gd, Tb, and Y 10 have been performed. From neutron powder diffraction it has not been possible to determine the spin direction in the basal plane, since these compounds have a trigonal crystal structure.…”

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confidence: 99%

Ho and Fe magnetic ordering in multiferroic HoFe3(BO3)4

et al. 2012

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Resonant and nonresonant x-ray scattering studies on HoFe 3 (BO 3 ) 4 reveal competing magnetic ordering of Ho and Fe moments. Temperature and x-ray polarization dependent measurements employed at the Ho L 3 edge directly reveal a spiral spin order of the induced Ho moments in the ab plane propagating along the c axis, a screw-type magnetic structure. At about 22.5 K the Fe spins are observed to rotate within the basal plane inducing spontaneous electric polarization, P. Components of P in the basal plane and along the c axis can be scaled with the separated magnetic x-ray scattering intensities of the Fe and Ho magnetic sublattices, respectively.

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