Effect of Thickness on Magnetic Dipolar and Exchange Interactions in SmCo-FeCo-SmCo Thin FilmsReport as inadecuate




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SmCo-FeCo-SmCotrilayer was deposited with two different thickness configurations for softphase FeCo; 50 nm-10 nm-50 nm and 50 nm-25 nm-50 nm were deposited on Si111 substrate and Ta 50 nm seed layer by RF magnetron sputtering in apressure, p, of 30 - 35 m Torr. After deposition the films were annealed underAr atmosphere at temperature T equal to 923 and 973 for different timesfollowed by quenching in water. X-ray diffraction patterns were obtained toidentified phase presents and calculate average crystallite size. To study theeffect of configuration thickness in soft phases, DC magnetic measurements werecarried out; the measurements were done in the temperature interval of 300 - 50K. Hysteresis loops collected at low temperatures exposed an increment incoercivity with the decrease of T and at same time, presented a -knee- in thesecond quadrant of the demagnetization curve, which suggests that theinter-layer exchange coupling becomes less effective, being more evident forsample with 50 nm-25 nm-50 nm thickness. Moreover, δM H plots were calculatedfrom magnetic measurements at three different temperatures, T, equal to 300,150 and 50 K, which corroborates that the dipolar interactions became strongerwhen thickness of soft phases increases. Finally, the thickness effect is attributedto the SmCo5 phase magnetocrystalline anisotropy constant, which isresponsible for the exchange coupling length.

KEYWORDS

Exchange Interactions, Dipolar Interaction, Anisotropy

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Rodríguez, C. , Mancilla, J. , Chavez, K. , Magaña, F. , Méndez, S. and Galindo, J. 2015 Effect of Thickness on Magnetic Dipolar and Exchange Interactions in SmCo-FeCo-SmCo Thin Films. Advances in Materials Physics and Chemistry, 5, 368-373. doi: 10.4236-ampc.2015.59037.





Author: Carlos Iván Rodríguez Rodríguez1,2, José Rurik Farías Mancilla1, Karla Edith Vega Chavez2, Francisco Espinosa Magaña3, Sion

Source: http://www.scirp.org/



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