Unique magnetic behaviour of TmFeAl

Mulders, A. M.; Kraan, W.H.; Ball, A.R.; Brück, E.; Buschow, K.H.J.; Gubbens, P.C.M.

doi:10.1007/bf02150171

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…Above 60 K, 169 Tm Mössbauer spectra show asymmetric doublet, characteristic of paramagnetic materials. 57 Fe Mössbauer spectra show distribution of Fe moment with an average Hhf of 7.5 T [563].…”

Section: μSr Nmr and Esrmentioning

confidence: 98%

“…57 Fe Mössbauer spectra for NdFeAl show hypefine splitting at 240 K, while room temperature spectrum is typical for paramagnetic material [457]. Mulders et al [563] performed 169 Tm and 57 Fe Mössbauer experiments for TmFeAl and reported that below 10 K the 169 Tm Mössbauer spectrum shows sextuplet, characteristic of magnetically ordered Tm sublattice. The hyperfine field at Tm nuclei estimated from the energy difference between two outer Mössbauer absorption peaks is of 710 T, which is close to the value expected from free Tm ion moment of 7 µB (720 T).…”

Section: μSr Nmr and Esrmentioning

confidence: 99%

“…57 Fe Mössbauer spectra for NdFeAl show hypefine splitting at 240 K, while room temperature spectrum is typical for paramagnetic material [457]. Mulders et al [563] performed 169 anisotropic Debye-Waller factor and may arise due to presence of impurity phases in these compounds [564]. These compounds show a decrease in isomer shift when going from Tb to…”

Section: μSr Nmr and Esrmentioning

confidence: 99%

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Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

256

124

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RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al, Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics compounds. These compounds crystallize in different crystal structures depending on the constituents. Though these compounds have been known for a long time, they came to limelight recently in view of the large magnetocaloric effect (MCE) and magnetoresistance (MR) shown by many of them. Most of these compounds crystallize in hexagonal and tetragonal crystal structures. Some of them show crystal structure modification with annealing temperature; while a few of them show iso-structural transition in the paramagnetic regime. Their magnetic ordering temperatures vary from very low temperatures to temperatures well above room temperature (~510 K). Depending on the crystal structure, they show a variety of magnetic and electrical properties.These compounds have been characterized by means of a variety of techniques/measurements such as x-ray diffraction, neutron diffraction, magnetic properties, heat capacity, magnetocaloric properties, electrical resistivity, magnetoresistance, thermoelectric power, thermal expansion, Hall effect, optical properties, XPS, Mössbauer spectroscopy, ESR, μSR, NMR, NQR etc. Some amount of work on theoretical calculations on electronic structure, crystal field interaction and exchange interactions has also been reported. The interesting aspect of this series is that they show a variety of physical properties such as Kondo effect, heavy fermion behavior, spin glass state, intermediate valence, superconductivity, multiple magnetic transitions, metamagnetism, large MCE, large positive as well as negative MR, spin orbital compensation, magnetic polaronic behavior, pseudo gap effect etc.Except Mn, no other transition metal in these compounds possesses considerable magnetic moments.Because of this RMnX compounds in general have high ordering temperatures. Interstitial modification using hydrogen and nitrogen is found to alter their crystal structures and magnetic properties considerably. RTX compounds also show interesting pressure effects on their structural and magnetic properties. In summary, these compounds show variety of physical properties over a wide range of temperatures. This review is intended to cover all the important results obtained in this family, particularly in the last few years.

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Section: μSr Nmr and Esrmentioning

confidence: 98%

Section: μSr Nmr and Esrmentioning

confidence: 99%

“…57 Fe Mössbauer spectra for NdFeAl show hypefine splitting at 240 K, while room temperature spectrum is typical for paramagnetic material [457]. Mulders et al [563] performed 169 anisotropic Debye-Waller factor and may arise due to presence of impurity phases in these compounds [564]. These compounds show a decrease in isomer shift when going from Tb to…”

Section: μSr Nmr and Esrmentioning

confidence: 99%

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Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

256

124

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“…The J value for TbFeAl can be approximated by the value J Tm-Tm ≈ 1 K for TmFeAl [23]. The spin value for Tb 3+ is S = 3 and a value of K ≈ 10 3 J/m 3 is adopted from the typical values for TmFeAl [24]. From the structural refinement using x-ray data, the nearest-neighbour distance a for TbFeAl (Tb-Tb distance) is obtained as 0.343 nm.…”

mentioning

confidence: 99%

“…Among RFeAl (R = rare earth) compounds, Tm-FeAl is reported to display unique magnetic properties [20,23,24]. The formation of nano-scaled magnetic domains in TmFeAl was discovered through Mößbauer spectroscopy [24].…”

mentioning

confidence: 99%

Exchange bias-like effect in TbFeAl induced by atomic disorder

Nair

Strydom

2016

EPL

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Exchange bias-like effect observed in the intermetallic compound TbFeAl, which displays a magnetic phase transition at T h c ≈ 198 K and a second one at T l c ≈ 154 K, is reported. Jump-like features are observed in the isothermal magnetization, M (H), at 2 K which disappear above 8 K. The field-cooled magnetization isotherms below 10 K show loop-shifts that are reminiscent of exchange bias, also supported by training effect. Significant coercive field, Hc ≈ 1.5 T at 2 K is observed in TbFeAl which, after an initial increase, shows subsequent decrease with temperature. The exchange bias field, H eb , shows a slight increase and subsequent leveling off with temperature. It is argued that the inherent crystallographic disorder among Fe and Al and the high magnetocrystalline anisotropy related to Tb 3+ lead to the exchange bias effect. TbFeAl is recently reported to show magnetocaloric effect and the present discovery of exchange bias makes this compound a multifunctional one. The result obtained on TbFeAl generalizes the observation of exchange bias in crystallographically disordered materials and gives impetus for the search for materials with exchange bias induced by atomic disorder. PACS numbers:Reviews on exchange bias [1][2][3][4] in materials point toward the importance of this effect in read-heads in magnetic recording,[5] giant magnetoresistive random access memory devices [6] and in permanent magnets. [7] Interpreted as phenomena occurring at the interface between magnetically ordered microscopic regions, exchange bias interfaces can be ferromagnetic/antiferromagnetic or ferromagnetic/antiferromagnetic/spin-glass. Mixed magnetic interactions are deemed to be an important ingredient for this effect to occur. Recent work [8] promotes the importance of ferromagnetic spin structure in exchange bias and explains some of the anomalous features of exchange bias field. In this Letter we report on the observation of exchange bias-like effect in TbFeAl. RFeAl (R = rare earth) were first investigated by Oesterreicher.[9-11] Only the heavier rare earths were observed to form the stable MgZn 2 -type structure. TbFeAl is recently identified as a magnetocaloric [12] (albeit, a weak effect) which becomes a possibel "multifunctional" compound with the observation of exchange bias.As noted above, TbFeAl crystallizes in hexagonal MgZn 2 type crystal structure with P 6 3

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Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Gubbens

2012

Handbook of Magnetic Materials

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Unique magnetic behaviour of TmFeAl

Cited by 4 publications

References 9 publications

Review on magnetic and related properties of RTX compounds

Review on magnetic and related properties of RTX compounds

Exchange bias-like effect in TbFeAl induced by atomic disorder

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

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