Fig. 3cd: SHG intensity in the Ta(2nm)/Py(3nm)/Pt(2nm) sample as a function of QWP angle (THz pump beam ellipticity) measured in horizontal and vertical magnetisation geometry
The pump beam’s ellipticity was adjusted using a THz quarter-wave plate
(QWP) by varying its orientation angle from 0 deg. to 90 deg.

Calculated				Measured

THz polarization angle / SHG intensity for Horizontal magetization / SHG intensity for Vertical magetization


0.5	3.42208E-14	3.83664E-10	0	8.96084E-13	3.63039E-10
1	1.36717E-13	3.82659E-10	15	2.27464E-11	2.33615E-10
1.5	3.06991E-13	3.80993E-10	30	4.97326E-11	3.48403E-11
2	5.44222E-13	3.78677E-10	40	5.51267E-11	9.42893E-12
2.5	8.4727E-13	3.75728E-10	45	5.63289E-11	4.09314E-11
3	1.2147E-12	3.72168E-10	50	5.40814E-11	8.85678E-11
3.5	1.64478E-12	3.68021E-10	60	4.94573E-11	2.2057E-10
4	2.13551E-12	3.63317E-10	75	1.42914E-11	3.71606E-10
4.5	2.68467E-12	3.58086E-10	90	1.74631E-12	4.05815E-10
5	3.28979E-12	3.52365E-10			
5.5	3.9482E-12	3.46189E-10			
6	4.6571E-12	3.39599E-10			
6.5	5.4135E-12	3.32633E-10			
7	6.21432E-12	3.25334E-10			
7.5	7.05639E-12	3.17742E-10			
8	7.93647E-12	3.09899E-10			
8.5	8.8513E-12	3.01845E-10			
9	9.79759E-12	2.93622E-10			
9.5	1.07721E-11	2.85266E-10			
10	1.17715E-11	2.76816E-10			
10.5	1.27928E-11	2.68308E-10			
11	1.38327E-11	2.59774E-10			
11.5	1.48882E-11	2.51247E-10			
12	1.59564E-11	2.42756E-10			
12.5	1.70345E-11	2.34328E-10			
13	1.81199E-11	2.25987E-10			
13.5	1.92098E-11	2.17757E-10			
14	2.03019E-11	2.09657E-10			
14.5	2.13938E-11	2.01704E-10			
15	2.24834E-11	1.93915E-10			
15.5	2.35687E-11	1.86303E-10			
16	2.46478E-11	1.7888E-10			
16.5	2.57189E-11	1.71654E-10			
17	2.67803E-11	1.64634E-10			
17.5	2.78307E-11	1.57825E-10			
18	2.88686E-11	1.51233E-10			
18.5	2.98928E-11	1.44859E-10			
19	3.09022E-11	1.38707E-10			
19.5	3.18957E-11	1.32776E-10			
20	3.28724E-11	1.27067E-10			
20.5	3.38317E-11	1.21577E-10			
21	3.47726E-11	1.16304E-10			
21.5	3.56947E-11	1.11246E-10			
22	3.65973E-11	1.064E-10			
22.5	3.74801E-11	1.0176E-10			
23	3.83426E-11	9.73227E-11			
23.5	3.91845E-11	9.30831E-11			
24	4.00055E-11	8.90359E-11			
24.5	4.08055E-11	8.51757E-11			
25	4.15842E-11	8.14969E-11			
25.5	4.23416E-11	7.79939E-11			
26	4.30776E-11	7.46607E-11			
26.5	4.37922E-11	7.14917E-11			
27	4.44853E-11	6.84809E-11			
27.5	4.5157E-11	6.56226E-11			
28	4.58074E-11	6.2911E-11			
28.5	4.64365E-11	6.03406E-11			
29	4.70445E-11	5.79057E-11			
29.5	4.76314E-11	5.56009E-11			
30	4.81974E-11	5.3421E-11			
30.5	4.87426E-11	5.13608E-11			
31	4.92673E-11	4.94154E-11			
31.5	4.97714E-11	4.758E-11			
32	5.02554E-11	4.58499E-11			
32.5	5.07192E-11	4.42207E-11			
33	5.11631E-11	4.26881E-11			
33.5	5.15872E-11	4.12482E-11			
34	5.19918E-11	3.98968E-11			
34.5	5.2377E-11	3.86305E-11			
35	5.2743E-11	3.74456E-11			
35.5	5.30899E-11	3.63388E-11			
36	5.3418E-11	3.53069E-11			
36.5	5.37274E-11	3.43471E-11			
37	5.40182E-11	3.34565E-11			
37.5	5.42907E-11	3.26324E-11			
38	5.45449E-11	3.18725E-11			
38.5	5.4781E-11	3.11745E-11			
39	5.49991E-11	3.05363E-11			
39.5	5.51994E-11	2.9956E-11			
40	5.53819E-11	2.94318E-11			
40.5	5.55468E-11	2.8962E-11			
41	5.56942E-11	2.85454E-11			
41.5	5.58241E-11	2.81805E-11			
42	5.59366E-11	2.78662E-11			
42.5	5.60318E-11	2.76016E-11			
43	5.61098E-11	2.73859E-11			
43.5	5.61706E-11	2.72183E-11			
44	5.62142E-11	2.70983E-11			
44.5	5.62406E-11	2.70257E-11			
45	5.625E-11	2.7E-11			
45.5	5.62422E-11	2.70214E-11			
46	5.62173E-11	2.70897E-11			
46.5	5.61753E-11	2.72054E-11			
47	5.61161E-11	2.73686E-11			
47.5	5.60397E-11	2.75799E-11			
48	5.5946E-11	2.784E-11			
48.5	5.58351E-11	2.81497E-11			
49	5.57067E-11	2.85099E-11			
49.5	5.5561E-11	2.89218E-11			
50	5.53977E-11	2.93866E-11			
50.5	5.52168E-11	2.99058E-11			
51	5.50181E-11	3.0481E-11			
51.5	5.48016E-11	3.11138E-11			
52	5.45672E-11	3.18063E-11			
52.5	5.43147E-11	3.25604E-11			
53	5.40439E-11	3.33785E-11			
53.5	5.37547E-11	3.4263E-11			
54	5.3447E-11	3.52164E-11			
54.5	5.31207E-11	3.624155	9.24944E-12	6.19687E-11			
58	9.09719E-12	6.14706E-11			
58.5	8.94071E-12	6.09787E-11			
59	8.78019E-12	6.0493E-11			
59.5	8.61583E-12	6.00138E-11			
60	8.44784E-12	5.95411E-11			
60.5	8.27641E-12	5.90749E-11			
61	8.10175E-12	5.86153E-11			
61.5	7.92407E-12	5.81626E-11			
62	7.7436E-12	5.77166E-11			
62.5	7.56055E-12	5.72775E-11			
63	7.37514E-12	5.68454E-11			
63.5	7.18761E-12	5.64203E-11			
64	6.99817E-12	5.60023E-11			
64.5	6.80706E-12	5.55915E-11			
65	6.61451E-12	5.51879E-11			
65.5	6.42076E-12	5.47916E-11			
66	6.22604E-12	5.44026E-11			
66.5	6.03059E-12	5.40211E-11			
67	5.83464E-12	5.3647E-11			
67.5	5.63844E-12	5.32804E-11			
68	5.44222E-12	5.29213E-11			
68.5	5.24622E-12	5.25699E-11			
69	5.05069E-12	5.22261E-11			
69.5	4.85586E-12	5.18899E-11			
70	4.66196E-12	5.15615E-11			
70.5	4.46923E-12	5.12408E-11			
71	4.27791E-12	5.09279E-11			
71.5	4.08823E-12	5.06229E-11			
72	3.90042E-12	5.03257E-11			
72.5	3.71471E-12	5.00363E-11			
73	3.53132E-12	4.97549E-11			
73.5	3.35048E-12	4.94814E-11			
74	3.17241E-12	4.92158E-11			
74.5	2.99733E-12	4.89582E-11			
75	2.82544E-12	4.87087E-11			
75.5	2.65696E-12	4.84671E-11			
76	2.49209E-12	4.82336E-11			
76.5	2.33104E-12	4.80081E-11			
77	2.174E-12	4.77907E-11			
77.5	2.02115E-12	4.75814E-11			
78	1.87269E-12	4.73801E-11			
78.5	1.7288E-12	4.7187E-11			
79	1.58965E-12	4.7002E-11			
79.5	1.45542E-12	4.68251E-11			
80	1.32625E-12	4.66564E-11			
80.5	1.20232E-12	4.64958E-11			
81	1.08378E-12	4.63433E-11			
81.5	9.70756E-13	4.61991E-11			
82	8.634E-13	4.6063E-11			
82.5	7.6184E-13	4.5935E-11			
83	6.66199E-13	4.58153E-11			
83.5	5.76593E-13	4.57037E-11			
84	4.93131E-13	4.56004E-11			
84.5	4.15916E-13	4.55052E-11			
85	3.45041E-13	4.54182E-11			
85.5	2.80592E-13	4.53395E-11			
86	2.22647E-13	4.52689E-11			
86.5	1.71278E-13	4.52066E-11			
87	1.26547E-13	4.51524E-11			
87.5	8.85078E-14	4.51065E-11			
88	5.72073E-14	4.50688E-11			
88.5	3.26834E-14	4.50393E-11			
89	1.4966E-14	4.5018E-11			
89.5	4.07663E-15	4.50049E-11			
90	2.85361E-17	4.5E-11