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Influence of Temperature and Annealing on GMR in Sputtered Permalloy/Cu Multilayers

100%

Urbaniak M., Stobiecki F., Luciński T., Kopcewicz M., Grabias A., Aleksiejew J.

Acta Physica Polonica A

2000

vol. 97

issue 3

539-542

The influence of temperature and annealing on giant magnetoresistance of Si(100)/Cu(20 nm)/Py(2 nm)/(Cu(2 nm)/Py(2 nm))_{100} multilayer (Py = Ni_{83}Fe_{17}) sputtered at room temperature in double face-to-face configuration is reported. It was found that giant magnetoresistance value, ΔR_{GMR}/R_{sat} (where R_{sat} is the resistance in saturation), monotonically decreases with increasing temperature (4.5% at 173 K to about 1% at 373 K). This results from the decrease in magnetic change of resistance, ΔR_{GMR}, and to the lesser extent from an increase in R_{sat}, though both of them are caused by the shortening of electrons mean free path. The observed almost linear decrease in giant magnetoresistance saturation field with increasing temperature is explained by temperature changes of magnetization profile. Vibrating sample magnetometer measurements revealed that the increase in temperature results in pronounced decrease in remnant to saturation magnetization ratio (M_{r}/M_{s}) suggesting that at low temperatures magnetic bridges between Py layers play an important role in magnetization process. It is shown that proper annealing, by an annihilation of bridges and/or lateral decoupling, leads to an increase in giant magnetoresistance ratio from 3.4% in as deposited state to 4.7%.

Domains Stimulated Magnetostatic Coupling in NiFe/Au/Co/Au Multilayers Investigated by Complementary Methods

68%

Stobiecki F., Urbaniak M., Szymański B., Kuświk P., Schmidt M., Aleksiejew J., Weis T., Engel D., Lengemann D., Ehresmann A., Kopcewicz M.

Acta Physica Polonica A

2009

vol. 115

issue 1

345-347

The magnetic structure of Ni_{80}Fe_{20}/Au/Co/Au multilayers characterized by easy-plane and easy-axis perpendicular to the sample plane anisotropies for NiFe and Co, respectively, is strongly modified by magnetostatic coupling resulting from stray fields of stripe domains in the Co layers. Using complementary methods it will be shown that the magnetostatic coupling increases with decreasing Au spacer thickness, with the weakening of the easy plane anisotropy of the NiFe layers and with increasing thickness of the Co layers.

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2 Acta Physica Polonica A

1 2009

1 2000

2 Aleksiejew J.

2 Kopcewicz M.

2 Stobiecki F.

2 Urbaniak M.

1 Ehresmann A.

1 Engel D.

1 Grabias A.

1 Kuświk P.

1 Lengemann D.

1 Luciński T.

1 Schmidt M.

1 Szymański B.

1 Weis T.

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Influence of Temperature and Annealing on GMR in Sputtered Permalloy/Cu Multilayers

Domains Stimulated Magnetostatic Coupling in NiFe/Au/Co/Au Multilayers Investigated by Complementary Methods