Dielectric tensor characterization for magneto-optical recording media

Andy F. Zhou; J. Kevin Erwin; Charles F. Brucker; M. Mansuripur

doi:10.1364/AO.31.006280

Applied Optics
Vol. 31,
Issue 29,
pp. 6280-6286
(1992)
•https://doi.org/10.1364/AO.31.006280

Dielectric tensor characterization for magneto-optical recording media

Andy F. Zhou, J. Kevin Erwin, Charles F. Brucker, and M. Mansuripur

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Andy F. Zhou, J. Kevin Erwin, Charles F. Brucker, and M. Mansuripur, "Dielectric tensor characterization for magneto-optical recording media," Appl. Opt. 31, 6280-6286 (1992)

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Abstract

A new and comprehensive dielectric-tensor characterization method was used for the characterization of magneto-optical recording media. The effect of film thickness and bilayer thickness on the magneto-optic Kerr effect was studied for a series of Co–Pd samples. The composition dependencies of the dielectric tensor for both Co–Pt and Co–Pd superlattice samples were measured, and the enhancement of the magneto-optical Kerr effect for these samples was studied.

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Curve No.	Detector Signal Useda	PBS Setting (deg)	Wollaston Setting (deg)	Physical Description
1	S1 + S2	0	45	r_p²
2	S1 + S2	90	45	r_s²
3	S1 − S2	45	45	r_pr_s cos(ϕ_p − ϕ_s)
4	S1 − S2	0	45	r_pr_⊥ cos(ϕ_p − ϕ_⊥)
5	S1 − S2	0	0	r_pr_⊥ sin(ϕ_p − ϕ_⊥)
6	S1 − S2	90	45	r_sr_⊥ cos(ϕ_s − ϕ_⊥)
7	S1 − S2	90	0	r_sr_⊥ sin(ϕ_s − ϕ_⊥)

Sample	Composition (Co/Pd in angstroms)	No. of Bilayers	Magneto-optic Film Thickness (nm)	Coercivity (kOe)	∊_xx	∊_xy	θ_k (deg)	∊_k (deg)	R
a1	2/9	5	5.5	0.42	−15.6 + i12.9	0.045 − i0.075	0.10	0 04	0.19
a1	2/9	5	5.5	0.42	−15.6 + i12.9	0.045 − i0.075	(0.12)	(0.02)	(0.19)
a2	2/9	10	11.0	1.57	−10.4 + i11.5	0.099 − i0.099	0.20	0.05	0.31
a2	2/9	10	11.0	1.57	−10.4 + i11.5	0.099 − i0.099	(0.20)	(0.04)	(0.33)
a3	2/9	15	16.5	2.42	−12.6 + i13.8	0.153 − i0.127	0.19	0.07	0.47
a3	2/9	15	16.5	2.42	−12.6 + i13.8	0.153 − i0.127	0.19	(0.06)	(0.46)
a4	2/9	20	22.0	2.08	−10.4 + i13.3	0.128 − i0.132	(0.17)	0.08	0.51
a4	2/9	20	22.0	2.08	−10.4 + i13.3	0.128 − i0.132	(0.16)	(0.08)	(0.52)
a5	2/9	25	27.5	2.29	−10.5 + i13.7	0.141 − i0.130	0.15	0.08	0.57
a5	2/9	25	27.5	2.29	−10.5 + i13.7	0.141 − i0.130	(0.15)	(0.08)	(0.55)
a6	2/9	30	33.0	2.29	−11.5 + i13.1	0.156 − i0.118	0.13	0.08	0.62
a6	2/9	30	33.0	2.29	−11.5 + i13.1	0.156 − i0.118	(0.13)	(0.08)	(0.62)

Sample	Composition (Co/Pt in angstroms)	Co Content (at. %)	Magneto-optic Film Thickness (nm)	Coercivity (kOe)	Saturated Magnetization/Co Volume (emu/cc)	∊_xx	∊_xy	θ_k (deg)	∊_k (deg)	R
Pt	—	0	bulk	—	0	−11.79 + i19.34	0 − 0	—	—	—
b1	2/10	16.7	30.0	1.45	1380	−15.92 + i17.77	0.291 − i0.050	0.15	0.02	0.67
b1	2/10	16.7	30.0	1.45	1380	−15.92 + i17.77	0.291 − i0.050	(0.14)	(0.02)	(0.69)
b2	2.5/10	20	30.0	1.69	1380	−15.72 + i17.49	0.326 − i0.050	0.17	0.02	0.67
b2	2.5/10	20	30.0	1.69	1380	−15.72 + i17.49	0.326 − i0.050	(0.16)	(0.01)	(0.68)
b3	3/10	23.1	29.9	1.45	1423	−15.17 + i15.24	0.303 − i0.012	0.18	0.01	0.66
b3	3/10	23.1	29.9	1.45	1423	−15.17 + i15.24	0.303 − i0.012	(0.18)	(0.01)	(0.68)
b4	4/10	28.6	29.4	0.91	1255	−14.79 + i17.27	0.404 − i0.024	0.22	−0.01	0.66
b4	4/10	28.6	29.4	0.91	1255	−14.79 + i17.27	0.404 − i0.024	0.21	(−0.01)	(0.66)
Co	—	100	bulk	—	1430	−11.89 + i19.17	0.429 − i0.146	—	—	—

Sample	Composition (Co/Pt in angstroms)	Co Content (at. %)	Magneto-optic Film Thickness (nm)	Coercivity (kOe)	∊_xx	∊_xy	θ_k (deg)	∊_k (deg)	R
Pd	0	0	bulk	—	−14.93 + i15.05	0 − 0	—	—	—
c1	2/13.5	12.9	15.0	1.49	−16.65 + i16.86	0.120 − i0.149	0.12	0.08	0.51
c1	2/13.5	12.9	15.0	1.49	−16.65 + i16.86	0.120 − i0.149	(0.11)	(0.07)	(0.52)
c2	4/18	18.2	15.0	1.16	−14.52 + i14.67	0.143 − i0.109	0.16	0.06	0.47)
c2	4/18	18.2	15.0	1.16	−14.52 + i14.67	0.143 − i0.109	0.15)	(0.05)	(0.45)
c3	4/13.5	22.9	15.0	0.65	−13.66 + i14.86	0.191 − i0.118	0.21	0.04	0.46)
c3	4/13.5	22.9	15.0	0.65	−13.66 + i14.86	0.191 − i0.118	(0.20)	(0.04)	(0.47)
c4	6/18	25	15.0	0.20	−10.99 + i14.43	0.143 − i0.102	0.19	0.02	0.42
c4	6/18	25	15.0	0.20	−10.99 + i14.43	0.143 − i0.102	(0.19)	(0.01)	(0.43)
c5	4/9	30.8	15.0	0.52	−11.07 + i15.19	0.220 − i0.121	0.25	−0.01	0.43
c5	4/9	30.8	15.0	0.52	−11.07 + i15.19	0.220 − i0.121	(0.25)	(−0.02)	(0.43)
c6	2/4.5	30.8	15.0	0.76	−11.09 + i15.38	0.220 − i0.117	0.25	−0.01	0.43
c6	2/4.5	30.8	15.0	0.76	−11.09 + i15.38	0.220 − i0.117	(0.23)	(−0.02)	(0.43)

Curve No.	Detector Signal Useda	PBS Setting (deg)	Wollaston Setting (deg)	Physical Description
1	S1 + S2	0	45	r_p²
2	S1 + S2	90	45	r_s²
3	S1 − S2	45	45	r_pr_s cos(ϕ_p − ϕ_s)
4	S1 − S2	0	45	r_pr_⊥ cos(ϕ_p − ϕ_⊥)
5	S1 − S2	0	0	r_pr_⊥ sin(ϕ_p − ϕ_⊥)
6	S1 − S2	90	45	r_sr_⊥ cos(ϕ_s − ϕ_⊥)
7	S1 − S2	90	0	r_sr_⊥ sin(ϕ_s − ϕ_⊥)

Abstract

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Applied Optics