Vibrating coil magnetometer for milli-Kelvin temperatures

Legl, S.; Pfleiderer, C.; Krämer, Karl

doi:10.1063/1.3374557

Cited by 14 publications

(10 citation statements)

References 19 publications

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“…All of these requirements are met by the vibrating coil magnetometer (VCM) [36,37] we used to measure the magnetization of Ho 2 Ti 2 O 7 . Data reported in the following between 0.04 K and ∼ 1.8 K correspond to the properties for field parallel to [111] within a few tenths of a degree.…”

Section: Arxiv:12065089v1 [Cond-matstr-el] 22 Jun 2012mentioning

confidence: 99%

First Order Metamagnetic Transition inHo2Ti2O7Observed by Vibrating Coil Magnetometry at Milli-Kelvin Temperatures

et al. 2012

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We report vibrating coil magnetometry of the spin-ice system Ho(2)Ti(2)O(7) down to ~0.04 K for magnetic fields up to 5 T applied parallel to the [111] axis. History-dependent behavior emerges below T(0)(*) ~ 0.6 K near zero magnetic field, in common with other spin-ice compounds. In large magnetic fields, we observe a magnetization plateau followed by a hysteretic metamagnetic transition. The temperature dependence of the coercive fields as well as the susceptibility calculated from the magnetization identify the metamagnetic transition as a line of first order transitions terminating in a critical end point at T(m)(*) 0.37 ~/= K, B(m) ~/= 1.5 T. The metamagnetic transition in Ho(2)Ti(2)O(7) is strongly reminiscent of that observed in Dy(2)Ti(2)O(7), suggestive of a general feature of the spin ices.

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Section: Arxiv:12065089v1 [Cond-matstr-el] 22 Jun 2012mentioning

confidence: 99%

First Order Metamagnetic Transition inHo2Ti2O7Observed by Vibrating Coil Magnetometry at Milli-Kelvin Temperatures

et al. 2012

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“…In this Letter we address, to the best of our knowledge for the first time, the properties of Tb 2 Ti 2 O 7 and the possible existence of QSI down to sufficiently low temperatures under conditions avoiding parasitic modifications of the field history. The magnetization of a Tb 2 Ti 2 O 7 single-crystal was measured at TUM using a bespoke vibrating-coil magnetometer (VCM) for temperatures down to ∼ 0.04 K and magnetic fields up to 5 T [36,37]. Our VCM represents a new development previously thought to be prohibitively difficult.…”

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confidence: 99%

Vibrating-Coil Magnetometry of the Spin Liquid Properties ofTb2Ti2O7

et al. 2012

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We have explored the spin liquid state in Tb(2)Ti(2)O(7) with vibrating-coil magnetometry down to ~0.04 K under magnetic fields up to 5 T. We observe magnetic history dependence below T*~0.2 K reminiscent of the classical spin ice systems Ho(2)Ti(2)O(7) and Dy(2)TiTi(2)O(7). The magnetic phase diagram inferred from the magnetization is essentially isotropic, without evidence of magnetization plateaus as anticipated for so-called quantum spin ice, predicted theoretically for [111] when quantum fluctuations renormalize the interactions. Instead, the magnetization for T≪T* agrees semiquantitatively with the predictions of "all-in-all-out" (AIAO) antiferromagnetism. Taken together, this suggests that the spin liquid state in Tb(2)Ti(2)O(7) is akin to an incipient AIAO antiferromagnet.

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“…The technique we describe here to exploit the sensitivity of microcantilevers for measurements of isotropic magnetisation is, therefore, a useful advance in this field, offering an improvement of several orders of magnitude on the sensitivities of commercial magnetometers. Commercial systems currently available have best sensitivities of 10 −8 -10 −11 J/T for isotropic magnetisation 35 and, in most cases, do not operate below 1.9 K or above 16 T. More specialised systems to measure magnetisation to very low temperature 17,36,37 or very high magnetic field 17,18 have been reported, but the sensitivity of our magnetometer over a wide field range compares favourably in each case. The convenience and speed at which a measurement of both the isotropic and anisotropic magnetisation can be carried out are considerable additional advantages of our technique.…”

Section: Discussion and Perspectivesmentioning

confidence: 99%

High sensitivity magnetometer for measuring the isotropic and anisotropic magnetisation of small samples

McCollam

Rhee

Rook

et al. 2011

Review of Scientific Instruments

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We describe how the full, isotropic and anisotropic, magnetisation of samples as small as tens of micrometers in size can be sensitively measured using a piezoresistive microcantilever and a small, moveable ferromagnet. Depending on the position of the ferromagnet, a strong but highly local field gradient of up to ∼4200 T/m can be applied at the sample or removed completely during a single measurement. In this way, the magnetic force and torque on the sample can be independently determined without moving the sample or cycling the experimental system. The technique can be used from millikelvin temperatures to ∼85 K and in magnetic fields from 2 T to the highest fields available. We demonstrate its application in measurements of the semimagnetic semiconductor Hg 1−x Fe x Se, where we achieved a moment sensitivity of better than 2.5 × 10 −14 J/T for both isotropic and anisotropic components.

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Vibrating coil magnetometer for milli-Kelvin temperatures

Cited by 14 publications

References 19 publications

First Order Metamagnetic Transition inHo2Ti2O7Observed by Vibrating Coil Magnetometry at Milli-Kelvin Temperatures

First Order Metamagnetic Transition inHo2Ti2O7Observed by Vibrating Coil Magnetometry at Milli-Kelvin Temperatures

Vibrating-Coil Magnetometry of the Spin Liquid Properties ofTb2Ti2O7

High sensitivity magnetometer for measuring the isotropic and anisotropic magnetisation of small samples

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