Annealing Effect on Exchange Bias in NiFe/FeMn/CoFe Trilayer Thin Films

Kim, Ki-Yeon; Choi, Hyeok-Cheol; You, Chun‐Yeol; Lee, Jeong-Soo

doi:10.4283/jmag.2008.13.3.097

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…Such a reduction in H E in low-temperature annealing is a fairly common phenomenon. [12][13][14][15] The cause of this reduction might be a strain relief in the crystal structure or movement of impurities from the interior of grains to the grain boundaries. Both phenomena have an impact on the state of inter-layer interface, which, in turn, determines an exchange coupling across the interface between the FeNi and FeMn spins.…”

Section: Resultsmentioning

confidence: 99%

Exchange biased FeNi/FeMn bilayers with coercivity and switching field enhanced by FeMn surface oxidation

et al. 2013

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FeNi/FeMn bilayers were grown in a magnetic field and subjected to heat treatments at temperatures of 50 to 350 °C in vacuum or in a gas mixture containing oxygen. In the as-deposited state, the hysteresis loop of 30 nm FeNi layer was shifted. Low temperature annealing leads to a decrease of the exchange bias field. Heat treatments at higher temperatures in gas mixture result in partial oxidation of 20 nm thick FeMn layer leading to a nonlinear dependence of coercivity and a switching field of FeNi layer on annealing temperature. The maximum of coercivity and switching field were observed after annealing at 300 °C.

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Section: Resultsmentioning

confidence: 99%

Exchange biased FeNi/FeMn bilayers with coercivity and switching field enhanced by FeMn surface oxidation

et al. 2013

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“…Details of a sample preparation can be found elsewhere. 20 The film thickness and growth texture were characterized by low-angle x-ray reflectivity and high-angle θ/2θ x-ray diffraction (not shown here).…”

Section: Methodsmentioning

confidence: 99%

Long-range interlayer-coupled magnetization reversal mediated by the antiferromagnetic layer in Py/FeMn/CoFe trilayers

Kim

Choi

et al. 2011

Phys. Rev. B

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With a combination of vector magneto-optical Kerr effect magnetometry and polarized neutron reflectometry, the detailed magnetization reversal mechanism of the exchange-biased Py(30-nm)/FeMn[t AFM = (0-30)-nm]/CoFe(30-nm) trilayers was studied. We found that Py/FeMn(15-nm) and FeMn(15-nm)/CoFe bilayers show completely different magnetization reversal modes, whereas they become very similar to each other in the corresponding Py/FeMn/CoFe trilayers. This is convincing evidence that the 15-nm FeMn layer mediates the magnetization reversal behaviors of both Py and CoFe layers through interlayer exchange bias coupling. Furthermore, magnetization reversal of Py and CoFe layers are decoupled for t AFM = 30 nm, indicating that the exchange length the magnetization reversal between two adjacent ferromagnetic layers is correlated over is less than 30 nm. This is in reasonable agreement with the theoretically predicted domain-wall width such as 28 nm for the polycrystalline FeMn/Co bilayer and 50 nm for the perfect Fe 50 Mn 50 crystal.

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“…In addition, 30-nm NiFe/15-nm FeMn and 15-nm FeMn/30-nm CoFe bilayers and 30-nm NiFe and 30-nm CoFe single layers were prepared for comparison with the trilayers. The sample preparation has already been described elsewhere [19]. A magnetic field of 300 Oe was applied along the sample plane during deposition to induce the exchange anisotropy.…”

Section: Methodsmentioning

confidence: 99%

Magnetization Reversal of Exchange-biased Bilayers and Trilayers Probed using Front and Back LT-MOKE

Kim¹,

Kim²,

Choi³

et al. 2009

Journal of Magnetics

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Magneto-optical Kerr effect (MOKE) magnetometry was used to investigate magnetization reversal dynamics in 30-nm NiFe/15-nm FeMn, 15-nm FeMn/30-nm CoFe bilayers, and 30-nm NiFe/(2,10)-nm FeMn/30-nm CoFe trilayers. The in-plane magnetization components of each ferromagnetic layer, both parallel and perpendicular to the applied field, were separately determined by measuring the longitudinal and transverse MOKE hysteresis loops from both the front and back sides of the film for an oblique incident s-polarized beam. The magnetization of the FeMn/CoFe bilayer was reversed abruptly and symmetrically through nucleation and domain wall propagation, while that of the NiFe/FeMn bilayer was reversed asymmetrically with a dominant rotation. In the NiFe/FeMn/CoFe trilayers, the magnetic reversal of the two ferromagnetic layers proceeded via nucleation and domain wall propagation for 2-nm FeMn, but via asymmetric rotation for 10-nm FeMn. The exchange-biased ferromagnetic layers showed the magnetization reversal along the same path in the film plane for the decreasing and increasing field branches from transverse MOKE hysteresis loops, which can be qualitatively explained by the theoretical model of the exchange-biased ferromagnetic/antiferromagnetic systems.

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Annealing Effect on Exchange Bias in NiFe/FeMn/CoFe Trilayer Thin Films

Cited by 9 publications

References 6 publications

Exchange biased FeNi/FeMn bilayers with coercivity and switching field enhanced by FeMn surface oxidation

Exchange biased FeNi/FeMn bilayers with coercivity and switching field enhanced by FeMn surface oxidation

Long-range interlayer-coupled magnetization reversal mediated by the antiferromagnetic layer in Py/FeMn/CoFe trilayers

Magnetization Reversal of Exchange-biased Bilayers and Trilayers Probed using Front and Back LT-MOKE

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