Magnetoresistance and transport properties of CoFeB/MgO granular systems

Bhutta K, Reiss G (2010)
JOURNAL OF APPLIED PHYSICS 107(11).

Journal Article | Published | English

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Abstract
Magnetoresistance and transport properties of ultrathin multilayers of CoFeB/MgO prepared by rf and dc magnetron sputtering were studied in the temperature range between 15 and 330 K. Due to the magnetic softness of CoFeB, this system offers a potentially high magnetoresistance at comparably low magnetic fields. At fixed MgO thickness of 0.7 nm, it undergoes a crossover from a granular to a multilayered structure with increasing thickness of CoFeB and metallic conduction is reached at around 0.8 nm. In the granular state, a ferromagnetic to superparamagnetic phase transition was observed at 130 K. Different charge transport phenomena were identified at different temperatures. A sharp increase in the magnetoresistance at low temperature can be attributed to higher order tunneling processes. By proper annealing procedures, an enhanced magnetoresistance of around 6% at room temperature and 14% at low temperature as well as an increase in the resistivity have been achieved. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3437278]
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Bhutta K, Reiss G. Magnetoresistance and transport properties of CoFeB/MgO granular systems. JOURNAL OF APPLIED PHYSICS. 2010;107(11).
Bhutta, K., & Reiss, G. (2010). Magnetoresistance and transport properties of CoFeB/MgO granular systems. JOURNAL OF APPLIED PHYSICS, 107(11).
Bhutta, K., and Reiss, G. (2010). Magnetoresistance and transport properties of CoFeB/MgO granular systems. JOURNAL OF APPLIED PHYSICS 107.
Bhutta, K., & Reiss, G., 2010. Magnetoresistance and transport properties of CoFeB/MgO granular systems. JOURNAL OF APPLIED PHYSICS, 107(11).
K. Bhutta and G. Reiss, “Magnetoresistance and transport properties of CoFeB/MgO granular systems”, JOURNAL OF APPLIED PHYSICS, vol. 107, 2010.
Bhutta, K., Reiss, G.: Magnetoresistance and transport properties of CoFeB/MgO granular systems. JOURNAL OF APPLIED PHYSICS. 107, (2010).
Bhutta, Khalid, and Reiss, Günter. “Magnetoresistance and transport properties of CoFeB/MgO granular systems”. JOURNAL OF APPLIED PHYSICS 107.11 (2010).
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