The STJ-030 is Micro Magnetics' low-field magnetic tunnel junction (a.k.a tunneling magnetoresistance) microsensor in SMA package. It features a Micro Magnetics SpinTJ sensor with an active (sensing) area of just a few microns (~0.0001") in size. This allows the STJ-030 to detect field signatures from single magnetic particles or microscopic magnetic media.

The field sensitivity of the STJ-030 is 5 nT, which is ten thousand times smaller than the magnetic field of the Earth. The geometry of the STJ-030 probe makes it perfect for magnetic imaging of currency, magnetic films, or media.

The STJ-030 is a two-terminal device which is accessed through a standard SMA connector.

• Superior field sensitivity of 5 nanotesla
• Active areas as small as 1x2 microns
• On-board ESD protection
• Small size
• Compact SMA connector
• Optional sensor polishing allows an approach distance of < 5 microns (0.0002")

PHYSICAL	Min.	Typical	Max.	Unit
Die Size		1.27 x 1.27		mm
Die Thickness	0.25	0.3		mm
Active Area Length		4		μm
Active Area Width		2		μm
Active Area Thickness		60	100	nm
Die Edge-to-Sensor Distance	75	175	200	μm
ELECTRICAL
Sensor Resistance	100	2000	50000	Ω
Lead Resistance	50	90	500	Ω
Recommended Operating Voltage	0.01	0.2	0.4	V
Maximum Operating Frequency	1	5	25	MHz
MAGNETIC
Total 4-Point Magnetoresistance	40	80	200	%
Magnetic Field Sensitivity	0.5	0.8	1.5	%/G
Non-linearity (+/- 1G)		0.25	2	%
Hysteresis (field range = +/- 1G)		0.01	0.05	G
Non-linearity (+/- 10G)		0.5	5	%
Hysteresis (field range = +/- 10G)		0.5	2	G
Equivalent Field Noise (100 Hz)	50	90	250	nT/Hz^2
Equivalent Field Noise (10 kHz)	5	10	25	nT/Hz^2