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Characteristics of a sensitive micro-Hall probe fabricated on chemical vapor deposited graphene over the temperature range from liquid-helium to room temperature
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10.1063/1.3640218
/content/aip/journal/apl/99/11/10.1063/1.3640218
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/11/10.1063/1.3640218

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Optical microscope image of GHP on SiO2/n-Si substrate. (b) Representative Raman spectrum measured on GHP (with a 473 nm laser). (c) I 2 D /IG intensity map of the Hall probe. (d) Selected traces of Rxx of the GHP as a function of the back gate voltage Vg at B = 0 tesla for temperature T = 4.2, 20, 60, and 130 K, from top to bottom. The Dirac point is ∼22 V, marked by the dotted line.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Magnetoresistance ΔRxx  = Rxx (Vg , B) – Rxx (Vg , 0) of GHP measured at various gate voltages Vg at T = 10 K. (b) Hall resistance Rxy of GHP taken at T = 10 K, the Hall resistance drop to ∼0 Ω while Vg approaches the Dirac region. (c) Characteristic lengths responsible for weak localization as a function of Vg . (d) Hall coefficients measured at various T as a function of Vg . The shaded area marks the Dirac region, defined by the transition area of RH .

Image of FIG. 3.
FIG. 3.

(Color online) (a) Noise power spectrum Sv of the Hall leads under different driving currents. The general temperature dependence and the magnitude of the flat band noises, , varying from 40 nV/Hz1/2 to 80 nV/Hz1/2 for T rising from 77 K to 300 K, can be described by Johnson noise. The traces of the upper branch (0.5 μA to 3 μA) are measured at 300 K, and those of the lower branch (7 μA and 4 μA) at 77 K. (b) SV of Rxx as a function of Vg . The dashed lines mark the cross-over frequency fc .

Tables

Generic image for table
Table I.

Room-temperature characteristic parameters, field sensitivity RH , optimal bias current Ibias , field resolution Bmin , cross-over frequency fc , and parasitic resistance Rs for three selected Hall probes.

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/content/aip/journal/apl/99/11/10.1063/1.3640218
2011-09-15
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characteristics of a sensitive micro-Hall probe fabricated on chemical vapor deposited graphene over the temperature range from liquid-helium to room temperature
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/11/10.1063/1.3640218
10.1063/1.3640218
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