Magnetic properties of synthetic fluorophlogopite mica crystals

Ma, Zheng; Skumryev, V.; Gich, Martí

doi:10.1039/d0ma00317d

Cited by 17 publications

(8 citation statements)

References 46 publications

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“…Furthermore, synthetic crystals of flurophlogopite mica were demonstrated to exhibit strong paramagnetic response at low temperatures. [ 60 ] We have reported the first observation of weak ferromagnetism in naturally occurring Fe‐rich talc at room temperature, confirming that the magnetic response remains down to the monolayer, and that even monolayers are fully air stable. [ 61 ]…”

Section: Introductionmentioning

confidence: 66%

Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals

Khan

Peil

Sharma

et al. 2023

Advanced Physics Research

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Magnetic monolayers show great promise for future applications in nanoelectronics, data storage, and sensing. The research in magnetic two‐dimensional (2D) materials focuses on synthetic iodides and tellurides, which suffer from a lack of ambient stability. So far, naturally occurring layered magnetic materials have been overlooked. These minerals offer a unique opportunity to explore complex air‐stable layered systems with high concentration of magnetic ions. Magnetic ordering in iron‐rich phyllosilicates is demonstrated, focusing on minnesotaite, annite, and biotite. These naturally occurring layered materials integrate local moment baring ions of iron via magnesium/aluminum substitution in their octahedral sites. Self‐inherent capping by silicate/aluminate tetrahedral groups enables air stability of ultra‐thin layers. Their structure and iron oxidation states are determined via Raman and X‐ray spectroscopies. Superconducting quantum interference device magnetometry measurements are performed to examine the magnetic ordering. Paramagnetic or superparamagnetic characteristics at room temperature are observed. Below 40 K ferrimagnetic or antiferromagnetic ordering occurs. In‐field magnetic force microscopy on exfoliated flakes confirms that the paramagnetic response at room temperature persists down to monolayers. Further, a correlation between the mixture of the oxidation states of iron and the critical ordering temperature is established, indicating a path to design materials with higher critical temperatures via oxidation state engineering.

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Section: Introductionmentioning

confidence: 66%

Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals

Khan

Peil

Sharma

et al. 2023

Advanced Physics Research

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“…Figure 2 a shows the XRD pattern of CFO on mica, where peaks related to CFO (blue spheres) and mica (red squares) are observed, matching with JCPDS cards No. 22-1086 and 71-1542 for CFO and fluorophlogopite mica, respectively [ 31 , 32 , 33 , 34 ]. The high-intensity peaks are associated with Bragg reflections produced by various pairs of mica layers, indicating the maintenance of a high-quality layered mica structure during the PLD deposition.…”

Section: Resultsmentioning

confidence: 99%

CoFe2O4 on Mica Substrate as Flexible Ethanol Gas Sensor in Self-Heating Mode

Kim,

Choi,

Jung

et al. 2024

Sensors

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In this study, a novel flexible ethanol gas sensor was created by the deposition of a CoFe2O4 (CFO) thin film on a thin mica substrate using the pulsed laser deposition technique. Transition electron microscopy (TEM) investigations clearly demonstrated the successful growth of CFO on the mica, where a well-defined interface was observed. Ethanol gas-sensing studies showed optimal performance at 200 °C, with the highest response of 19.2 to 100 ppm ethanol. Operating the sensor in self-heating mode under 7 V applied voltage, which corresponds to a temperature of approximately 200 °C, produced a maximal response of 19.2 to 100 ppm ethanol. This aligned with the highest responses observed during testing at 200 °C, confirming the sensor’s accuracy and sensitivity to ethanol under self-heating conditions. In addition, the sensor exhibited good selectivity to ethanol and excellent flexibility, maintaining its high performance after bending and tilting up to 5000 times. As this is the first report on flexible self-heated CFO gas sensors, we believe that this research holds great promise for the future development of high-quality sensors based on this approach.

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“…For the fluorphlogopite (023) peak, due to its monoclinic structure, only two reflections should be observed . However, fluorphlogopite is prone to have twining defects, resulting in different crystalline stackings, leading to the observed 6 peaks with a 60° separation between them . Moreover, FeRh (110) is expected to display four reflections due to its cubic structure .…”

Section: Resultsmentioning

confidence: 99%

“…52 However, fluorphlogopite is prone to have twining defects, resulting in different crystalline stackings, leading to the observed 6 peaks with a 60°separation between them. 53 Moreover, FeRh (110) is expected to display four reflections due to its cubic structure. 9 Figure 2a displays magnetization versus temperature (M(T)) curves obtained under a 100 Oe in-plane magnetic field for a 240 nm thick film.…”

Section: ■ Resultsmentioning

confidence: 99%

Robust Antiferromagnetic FeRh Films on Mica

Quintana,

Zarco,

Dix

et al. 2023

ACS Appl. Electron. Mater.

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FeRh shows an antiferromagnetic to ferromagnetic phase transition above room temperature, which permits its use as an antiferromagnetic memory element. However, its antiferromagnetic order is sensitive to small variations in crystallinity and composition, challenging its integration into flexible devices. Here, we show that flexible FeRh films of high crystalline quality can be synthesized by using mica as a substrate, followed by a mechanical exfoliation of the mica. The magnetic and transport data indicate that the FeRh films display a sharp antiferromagnetic to ferromagnetic phase transition. Magnetotransport data allow for the observation of two distinguishable resistance states, which are written after a field-cooling procedure. It is shown that the memory states are robust under the application of magnetic fields of up to 10 kOe.

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Magnetic properties of synthetic fluorophlogopite mica crystals

Abstract: Micas have recently attracted the interest of materials scientists to be used as flexible substrates for the growth of nanomaterials. Synthetic fluorophlogopite is particularly appealing due to its high thermal...

Cited by 17 publications

References 46 publications

Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals

Probing Magnetic Ordering in Air Stable Iron‐Rich Van der Waals Minerals

CoFe2O4 on Mica Substrate as Flexible Ethanol Gas Sensor in Self-Heating Mode

Robust Antiferromagnetic FeRh Films on Mica

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