Thermal stability of magneto-optic quadrilayers

Anthony, Thomas; Brug, J. A.; Naberhuis, S.; Birecki, H.

doi:10.1063/1.336866

Cited by 49 publications

(7 citation statements)

References 13 publications

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“…1b), indicating extraordinarily strong magnetic deactivation of Tb. As already discussed 15,43 , this is caused by a preferential oxidation of Tb, relative to Co, resulting in its stronger magnetic deactivation. A possible explanation is that IB creates diffusion paths (vacancy-type defects) that facilitate oxygen diffusion deep into the multilayer structure.…”

Section: Resultsmentioning

confidence: 73%

Subsystem domination influence on magnetization reversal in designed magnetic patterns in ferrimagnetic Tb/Co multilayers

Frąckowiak

Stobiecki

Chaves-O'Flynn

et al. 2021

Sci Rep

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Recent results showed that the ferrimagnetic compensation point and other characteristic features of Tb/Co ferrimagnetic multilayers can be tailored by He+ ion bombardment. With appropriate choices of the He+ ion dose, we prepared two types of lattices composed of squares with either Tb or Co domination. The magnetization reversal of the first lattice is similar to that seen in ferromagnetic heterostructures consisting of areas with different switching fields. However, in the second lattice, the creation of domains without accompanying domain walls is possible. These domain patterns are particularly stable because they simultaneously lower the demagnetizing energy and the energy associated with the presence of domain walls (exchange and anisotropy). For both lattices, studies of magnetization reversal show that this process takes place by the propagation of the domain walls. If they are not present at the onset, the reversal starts from the nucleation of reversed domains and it is followed by domain wall propagation. The magnetization reversal process does not depend significantly on the relative sign of the effective magnetization in areas separated by domain walls.

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Section: Resultsmentioning

confidence: 73%

Subsystem domination influence on magnetization reversal in designed magnetic patterns in ferrimagnetic Tb/Co multilayers

Frąckowiak

Stobiecki

Chaves-O'Flynn

et al. 2021

Sci Rep

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“…For stoichiometric Si3N4 cover layers no reaction between the magnetic and the protective layer is expected [1]. On the other hand it is known, that nitrogen affects the magnetic properties of ferrimagnetic TbFeCo films substantially due to a reaction between Tb and nitrogen.…”

Section: Introductionmentioning

confidence: 99%

“…This is quite in contrast to the conventional torque magnetometry, where the angle e is unknown. For the further analysis of the Kerr data we use a common approach for the anisotropy energy of the magnetic layer consisting of quadratic and bi-quadratic terms (1) The calculation with the procedure of Kerr Torque Magnetometry then provides the quadratic (2K/Ms = f..loHkl) and bi-quadratic (2K/M. ::::; f..loHu) terms of the anisotropy field within the information depth of the laser beam [7].…”

Section: Introductionmentioning

confidence: 99%

Changes in Magnetic Anisotropy of Mo Films Induced by Nitrogen Diffusion From Protective Layers

et al. 1996

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-REtrM films used for magneto-optical (MO) data storage are commonly covered with reactively sputtered SiN protective layers. For stoichiometric Si3N4 cover layers no reaction between the magnetic and the protective layer is expected. But if there is a surplus of nitrogen within the protective layer the magnetic properties and the long-term stability of the magnetic layer may be influenced. To investigate this we prepared ferrimagnetic TbFeCo-films covered with a SiN protective layer containing a surplus of nitrogen. For testing their long-term stability the films were annealed several times. To analyze the magnetic properties measurements ofKerr hyst.eresis were performed. The magnetic anisotropy was measured by Kerr Torque Magnetometry, a very sensitive magneto-optical' method which provides local information about the anisotropy field at the surface region of the magnetic layer. As a result substantial changes of the magnetic properties at the surface region of the TbFeCo layers were detected. These changes were induced by a diffusion of nitrogen from the protective into the magnetic layer leading to a reduced content of magnetically active Tb at the surface. At longer annealing times this led in extreme to a double layer behaviour which makes the medium useless for MO data storage.

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“…[3] assumes that the density of both phases is the same. It should also be noted that the Tb 148 eV peak appears to shift on oxidation, but this is difficult to verify or to quantify since it is virtually impossible to obtain a spectrum from a truly clean Tb surface because of its extreme reactivity [hHformatio n is --446 kcal/mol for Tb203 (12)].…”

Section: Internal Oxidation--in the Ioz The Oxidation State Ofmentioning

confidence: 99%

“…B e r n s t e i n a n d G u e u g n o n (1) a n d A n t h o n y et aI. (3) i n t e r p r e t e d m a g n e t i c m e a s u r em e n t s of F e T b a n d F e T b C o films p r o t e c t e d b y SiO2 films to s h o w t h a t Tb in t h e alloy reacts w i t h O f r o m t h e SiO2 to f o r m a t e r b i u m oxide.…”

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Oxidation of an Amorphous Iron‐Terbium Alloy

Frankenthal

Siconolfi

Dover

et al. 1987

J. Electrochem. Soc.

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APPENDIXFree energy functions of compounds a = (C1 + C~) x 1000 -(C2 + C7 + F)T = Temperature, K = Gas constant (= 1.987165 cal/deg/mol) = C3 (0 -1)(1 -1/0)/2 + C4 (ln 0 -1 + 1/0) + C~ (1 -1/0)2/2 = T/298.15 131, 923 (1984). Se,~es, Pennington, NJ (1985). 26. M. Allibert, C. Chattillon, K. T. Jacob, and R. Lourtau, J. Am. Ceram. Soc., 64, 307 (1981). 27. R. H. Lamoreaux and D. L. Hildenbrand, J. Phys. Chem. Ref. Data, 13, 151 (1984). Oxidation of an Amorphous ABSTRACTWe have studied the oxidation of an amorphous Feo.74Tbo.26 alloy in air at 200~ by Auger electron spectroscopy with depth profiling by argon ion sputtering. Initially, the alloy undergoes internal oxidation of Tb, the kinetics obeying a parabolic rate law. After the alloy has been internally oxidized, two oxide films form on its surface. There is an outer film of an iron spinel and an inner film of TbOx (1.5 < x < 1.8). The growth of the spinel layer follows parabolic kinetics, while the growth of the TbOx film obeys a nearly linear rate law.

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Thermal stability of magneto-optic quadrilayers

Cited by 49 publications

References 13 publications

Subsystem domination influence on magnetization reversal in designed magnetic patterns in ferrimagnetic Tb/Co multilayers

Subsystem domination influence on magnetization reversal in designed magnetic patterns in ferrimagnetic Tb/Co multilayers

Changes in Magnetic Anisotropy of Mo Films Induced by Nitrogen Diffusion From Protective Layers

Oxidation of an Amorphous Iron‐Terbium Alloy

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