Details

Autor(en) / Beteiligte

• Hankard, Fatim
• Gattacceca, Jérôme
• Fermon, Claude
• Pannetier-Lecoeur, Myriam
• Langlais, Benoit
• Quesnel, Yoann
• Rochette, Pierre
• McEnroe, Suzanne A.

Titel

Magnetic field microscopy of rock samples using a giant magnetoresistance–based scanning magnetometer

Ist Teil von

• Geochemistry, geophysics, geosystems : G3, 2009-10, Vol.10 (10), p.Q10Y06-n/a

Ort / Verlag

American Geophysical Union

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Wiley Journals

Beschreibungen/Notizen

• We have developed a new scanning magnetic microscope to image with micrometric resolution magnetic fields originating from room temperature polished samples. This microscope is based on a giant magnetoresistance (GMR) sensor working at room temperature. These magnetic sensors are sensitive to the in‐plane components of the magnetic field. The size of the sensing element is 9 μm × 36 μm. The noise of the GMR sensor is dominated by a low‐frequency 1/f noise. The field equivalent noise of the sensors is 10 nT at 1Hz and decreases to 0.3 nT above 1 kHz for a 1 mA sensing current. The spatial resolution of the system is ∼20 μm, and its peak‐to‐peak noise during operation is ∼250 nT. Its high spatial resolution and a minimum sensor‐to‐sample distance of 30 μm compensate for its rather moderate field sensitivity. This room temperature small‐sized and rugged magnetic microscope appears as a powerful instrument for small‐scale rock magnetic investigations.