Experimental determination of the dipolar field in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Mn</mml:mtext></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-acetate

McHugh, S.; Jaafar, Reem; Sarachik, M. P.; Myasoedov, Y.; Shtrikman, Hadas; Zeldov, E.; Bagai, Rashmi; Christou, George

doi:10.1103/physrevb.79.052404

Cited by 28 publications

(38 citation statements)

References 15 publications

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“…D: Position of dMz/dHz maxima (resonant fields) as a function of magnetization the experimental uncertainties involved (mainly associated with the accuracy in the determination of the demagnetization factor) this value agrees well with H eff = 515 ± 85 Oe, reported in Ref. [72]. In the latter work, the hysteresis loop of fast relaxing Mn 12 molecules [73] was used to monitor the magnetic field created by the standard, slower relaxing ones.…”

Section: Experimental Determination Of the Average Interaction Fieldssupporting

confidence: 81%

Dipolar Magnetic Order in Crystals of Molecular Nanomagnets

Luis

2014

NanoScience and Technology

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Abstract. This chapter reviews experimental studies of long-range dipolar magnetic order, of which few examples exist in Nature, in crystals of single-molecule magnets. Quantum annealing by a transverse magnetic field enables one to explore the ground state of highly anisotropic SMMs, such as Mn12 and Fe8, both of which order ferromagnetically below Tc = 0.9 K and 0.6 K, respectively. In Mn12 acetate, molecular tilts caused by the disorder in the orientations of some solvent molecules affect dramatically the character of the field-induced transition, which agrees with the predictions of the random-field Ising model. The existence of a quantum critical point has been shown in crystals of Fe8 clusters, which are among the best realizations of the archetypical quantum Ising model in a transverse magnetic field.

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Section: Experimental Determination Of the Average Interaction Fieldssupporting

confidence: 81%

Dipolar Magnetic Order in Crystals of Molecular Nanomagnets

Luis

2014

NanoScience and Technology

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“…The FM order is very strongly suppressed only when the quantum ßuctuations become important ͑when the tunnel splitting, , of the lowest spin states is comparable to the intermolecular dipole interactions, which occurs at ϳ7 T for Mn 12 -ac 20,21 ͒. However, in the presence of the tilt disorder described above, for transverse Þelds that establish longitudinal-Þeld components along the easy axis of tilted molecule comparable in magnitude to the intermolecular dipole Þeld ͑approximately 50 mT, 28 corresponding to 3 T for a tilt angle of 1¡͒, the tilted spins can no longer participate in the FM order and there is an effective dilution of the spins which causes a rapid reduction of the susceptibility and of the ordering temperature. 21 Figure 5 shows approximate values of the intercept T CW ͑squares͒ obtained from Þtting the high-temperature region of the experimental curves shown in Fig.…”

Section: Theoretical Results and Comparison To Datamentioning

confidence: 96%

Realization of random-field Ising ferromagnetism in a molecular magnet

et al. 2010

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The longitudinal magnetic susceptibility of single crystals of the molecular magnet Mn 12 -acetate obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase at ϳ0.9 K. With increasing magnetic Þeld applied transverse to the easy axis, a marked change is observed in the temperature dependence of the susceptibility, and the suppression of ferromagnetism is considerably more rapid than predicted by mean-Þeld theory for an ordered single crystal. Our results can instead be Þt by a Hamiltonian for a random-Þeld Ising ferromagnet in a transverse magnetic Þeld, where the randomness derives from the intrinsic distribution of locally tilted magnetic easy axes known to exist in Mn 12 -acetate crystals, suggesting that Mn 12 -acetate is a realization of the random-Þeld Ising model in which the random Þeld may be tuned by a Þeld applied transverse to the easy axis.

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“…Figure 2(a) shows the comparison of the magnetization curves between Mn 11 Cr* and Mn 12 taken at 0.5 K, Figure 2(b) demonstrates the derivatives of both magnetization curves. Among the twelve peaks of Mn 11 Cr*, Peak A 1 and A 2 are induced by the fast relaxation process of the minor Mn 12 [8]. Peak D 2 , D 3 and a small portion of Peak D 1 arise from RQTM of Mn 12 , all of which appear in the derivative curves of both Mn 12 and Mn 11 Cr*.…”

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confidence: 98%

New quantum tunneling steps in Mn11Cr/Mn12 mixed crystal

Zhou

Fan

et al. 2010

Sci. China Phys. Mech. Astron.

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Magnetic properties of Mn 11 Cr and Mn 12 mixed crystal at low temperature are studied. A new set of quantum tunneling steps discovered in magnetization curves suggests that there may exist another kind of single molecular magnet in this mixed crystal. quantum tunneling, molecular magnet, magnetization curve PACS: 75.50.Xx, 75.45.+j, 75.60.Ej Single molecular magnets (SMMs) have been widely studied in the last twenty years, because SMMs exhibit many macroscopic quantum effects such as staircase hysteresis loop [1], quantum interference effect [2], and avalanche effect [3]. SMMs are typically composed of metal ion clusters surrounded by organic complexes. Superexchange interactions within each molecule result in sizable single spin per molecule at low temperatures, and these spins are nearly isolated, because of this character, SMMs may have important applications in magnetic memory and quantum computing [4].Of all SMMs, Mn 12 -acetate is the first synthesized and has been studied extensively. Each molecule in a crystal of Mn 12 has a large total spin of S =10, and because of the strong easy axis anisotropy, it has high blocking temperature.

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Experimental determination of the dipolar field inMn12-acetate

Cited by 28 publications

References 15 publications

Dipolar Magnetic Order in Crystals of Molecular Nanomagnets

Dipolar Magnetic Order in Crystals of Molecular Nanomagnets

Realization of random-field Ising ferromagnetism in a molecular magnet

New quantum tunneling steps in Mn11Cr/Mn12 mixed crystal

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